refactor(docs)!: rename CLI binary to corestack-docs

go install names binaries after the directory, so cmd/docs installed an
ambiguous `docs` binary into $GOBIN that could clobber or be clobbered
by other tools. Move it to cmd/corestack-docs, matching corestack-goose,
and update goreleaser, CI, docs and usage text. Accepted ADRs keep their
text and gain a dated rename note.

BREAKING CHANGE: `go install go.auvem.com/corestack/cmd/docs@latest`
stops resolving after the next tag; use cmd/corestack-docs. @v0.1.0
still installs the old `docs` binary.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -2,11 +2,30 @@ name: ci
 
 on:
   push:
+    branches: [main]
+    paths-ignore:
+      # Keep embedded Markdown templates in CI; paths-ignore cannot undo a match.
+      - "*.md"
+      - "docs/**"
   pull_request:
+    paths-ignore:
+      - "*.md"
+      - "docs/**"
 
 jobs:
   check:
     runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:17-alpine
+        env:
+          POSTGRES_PASSWORD: page-test
+          POSTGRES_DB: page_test
+        options: >-
+          --health-cmd "pg_isready -U postgres -d page_test"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 12
     steps:
       - uses: actions/checkout@v7.0.1
         with:
@@ -18,7 +37,16 @@ jobs:
         run: test -z "$(gofmt -l .)"
       - run: go vet ./...
       - run: go test -race ./...
-      - run: go run ./cmd/docs check
+        env:
+          CI: "true"
+          MIGRATE_POSTGRES_DSN: postgres://postgres:page-test@postgres:5432/page_test?sslmode=disable
+          PAGE_POSTGRES_DSN: postgres://postgres:page-test@postgres:5432/page_test?sslmode=disable
+          PAGE_REQUIRE_POSTGRES: "1"
+      - name: Require issue URLs in TODO comments
+        run: |
+          find . -type d \( -name .git -o -name node_modules -o -name vendor -o -name generated -o -name gen -o -name target -o -name dist -o -name build -o -name .svelte-kit -o -name .next \) -prune -o -type f \( -name '*.go' -o -name '*.ts' -o -name '*.tsx' -o -name '*.js' -o -name '*.svelte' -o -name '*.rs' -o -name '*.sql' -o -name '*.sh' -o -name '*.proto' -o -name '*.graphql' -o -name '*.yml' -o -name '*.yaml' -o -name '*.toml' \) -exec awk 'match($0, "((^|[^:])[/][/]|[/][*]|(^|[[:space:]])(#|--)|^[[:space:]]*([*]|<!--))") { comment=substr($0, RSTART + RLENGTH); todo=index(comment, "TO" "DO"); if (todo && substr(comment, todo + 4) !~ "https?:[/][/]") { print FILENAME ":" FNR ":" $0; bad=1 } } END { exit bad }' {} + # shortcut: line-based scan can flag comment-like strings and misses multiline issue links, use a parser when these need accurate coverage
+      - name: Go lint
+        run: go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.15.0 run ./...
       - uses: goreleaser/goreleaser-action@v7.3.0
         with:
           distribution: goreleaser

.gitea/workflows/docs-check.yml

@@ -0,0 +1,15 @@
+name: Documentation
+on:
+  push:
+    branches: [main]
+  pull_request:
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7.0.1
+      - uses: actions/setup-go@v7.0.0
+        with:
+          go-version-file: go.mod
+          cache: false
+      - run: go run ./cmd/corestack-docs check

.gitea/workflows/release.yml

@@ -15,6 +15,9 @@ jobs:
       - uses: actions/setup-go@v7.0.0
         with:
           go-version-file: go.mod
+      - name: Require issue URLs in TODO comments
+        run: |
+          find . -type d \( -name .git -o -name node_modules -o -name vendor -o -name generated -o -name gen -o -name target -o -name dist -o -name build -o -name .svelte-kit -o -name .next \) -prune -o -type f \( -name '*.go' -o -name '*.ts' -o -name '*.tsx' -o -name '*.js' -o -name '*.svelte' -o -name '*.rs' -o -name '*.sql' -o -name '*.sh' -o -name '*.proto' -o -name '*.graphql' -o -name '*.yml' -o -name '*.yaml' -o -name '*.toml' \) -exec awk 'match($0, "((^|[^:])[/][/]|[/][*]|(^|[[:space:]])(#|--)|^[[:space:]]*([*]|<!--))") { comment=substr($0, RSTART + RLENGTH); todo=index(comment, "TO" "DO"); if (todo && substr(comment, todo + 4) !~ "https?:[/][/]") { print FILENAME ":" FNR ":" $0; bad=1 } } END { exit bad }' {} + # shortcut: line-based scan can flag comment-like strings and misses multiline issue links, use a parser when these need accurate coverage
       - uses: goreleaser/goreleaser-action@v7.3.0
         with:
           distribution: goreleaser

.golangci.yml

@@ -0,0 +1,12 @@
+version: "2"
+linters:
+  default: none
+  enable:
+    - revive
+  settings:
+    revive:
+      rules:
+        - name: exported
+        - name: package-comments
+  exclusions:
+    presets: []

.goreleaser.yaml

@@ -1,10 +1,10 @@
 version: 2
-project_name: docs
+project_name: corestack-docs
 
 builds:
-  - id: docs
+  - id: corestack-docs
-    main: ./cmd/docs
+    main: ./cmd/corestack-docs
-    binary: docs
+    binary: corestack-docs
     env:
       - CGO_ENABLED=0
     goos: [darwin, linux]
@@ -14,7 +14,7 @@ builds:
 
 archives:
   - formats: [tar.gz]
-    name_template: "docs_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    name_template: "corestack-docs_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
 
 checksum:
   name_template: checksums.txt

AGENTS.md

@@ -1,9 +1,51 @@
 # AGENTS.md
 
-Go module `go.auvem.com/corestack`. Reading map:
+## Commands
+- Check: `go build ./...`, `go vet ./...`, `go test -race ./...`, `go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.15.0 run ./...`; from the project root, run the TODO check below.
+- Generate: No code generation is configured; format with `gofmt -w .`.
+- Documentation: `go run ./cmd/corestack-docs check`; create records with `go run ./cmd/corestack-docs new adr|plan "Title"`. This checker repository uses its local implementation as the source of truth.
 
-- Build and test: `go build ./...`, `go vet ./...`, `go test -race ./...`; format with `gofmt -w .`.
+## Scope and decisions
-- Docs format (the spec `docs check` implements): `docs/docs-format.md`.
+- Before editing under a directory with its own AGENTS.md, read it. Scoped files: none currently; this root governs the repository, including nested Go modules unless nearer instructions override it.
-- Check records: `go run ./cmd/docs check`. Create one: `go run ./cmd/docs new adr|plan "Title"`.
+- Explicit user instructions win; nearer scoped rules override broader rules.
+- Distinguish confirmed requirements, proposed defaults and unresolved decisions; resolve material ambiguity before dependent work.
+- Proposed ADRs are context, not authority; read relevant accepted decisions before changing their scope.
+- Before final review and merge, reconcile affected records against the latest target branch plus the PR, following [/docs/adr/README.md](/docs/adr/README.md).
+- Documentation tier: ADRs only. Create a plan only when work needs durable execution context across areas, phases or sessions; then enable the plans tier.
+- In a sandbox, request required network/cache access before first codegen; on permission/cache errors retry once with that access. Never hand-edit generated output.
+- Shared databases and ports may belong to other worktrees/agents; read project rules before starting, stopping or resetting them.
+- Ask before lint/autofix changes that could alter runtime behavior.
+- Report commands actually run and their results; never claim an unrun check passed.
+- Name branches `<type>/<kebab>` without agent-name prefixes.
+
+## Comments
+- Document package/module purpose, ownership and boundaries, and every public/exported contract in native doc comments; document generated surfaces at their source.
+- Explain why at invariants, auth decisions, concurrency/ordering, destructive edges and deliberate deviations; no narration, changelog comments or commented-out code.
+- Use `invariant: <property>`, `authz: <who and enforcement>`, `shortcut: <limit>, <when to upgrade>` on relevant code; retain Go `Deprecated:` and Rust `// SAFETY:`.
+- Every TODO needs an issue URL; reviewers recheck tagged comments on touched code.
+
+## Project map
+
+Go module `go.auvem.com/corestack`.
+
+- Docs format (the spec `corestack-docs check` implements): `docs/docs-format.md`.
 - Decisions live in `docs/adr/`, plans in `docs/plans/`. Records are permanent; never rename them.
-- Dependencies are limited to `go.yaml.in/yaml/v3` and `github.com/yuin/goldmark`.
+- Add dependencies only to the module that needs them; heavy dependencies go in nested modules (see the [module-boundary ADR](/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md)).
+
+## Go
+- Default backend language is Go; follow existing package boundaries.
+- Define interfaces at the consumer only when a second implementation or a test seam needs one.
+- Wrap contextual errors with `%w`; inspect causes with `errors.Is`/`errors.As`.
+- Do not add package-level mutable state or `init` side effects.
+- Put `context.Context` first in parameters; never store it in a struct.
+- Give every goroutine an owner and a shutdown path.
+- Run `gofmt`, `go vet ./...`, tests and the project's configured linter from the owning module.
+- Use `.golangci.yml` (revive exported/package-comments); the pinned linter command is listed above.
+
+## TODO check
+
+Run from the project root (also enforced in CI):
+
+```sh
+find . -type d \( -name .git -o -name node_modules -o -name vendor -o -name generated -o -name gen -o -name target -o -name dist -o -name build -o -name .svelte-kit -o -name .next \) -prune -o -type f \( -name '*.go' -o -name '*.ts' -o -name '*.tsx' -o -name '*.js' -o -name '*.svelte' -o -name '*.rs' -o -name '*.sql' -o -name '*.sh' -o -name '*.proto' -o -name '*.graphql' -o -name '*.yml' -o -name '*.yaml' -o -name '*.toml' \) -exec awk 'match($0, "((^|[^:])[/][/]|[/][*]|(^|[[:space:]])(#|--)|^[[:space:]]*([*]|<!--))") { comment=substr($0, RSTART + RLENGTH); todo=index(comment, "TO" "DO"); if (todo && substr(comment, todo + 4) !~ "https?:[/][/]") { print FILENAME ":" FNR ":" $0; bad=1 } } END { exit bad }' {} + # shortcut: line-based scan can flag comment-like strings and misses multiline issue links, use a parser when these need accurate coverage
+```

README.md

@@ -1,25 +1,89 @@
 # corestack go
 
-Shared Go building blocks. The first one is `docs`, a checker for architecture decision records (ADRs) and implementation plans.
+Shared Go building blocks. Includes `corestack-docs`, a checker for architecture decision records (ADRs) and implementation plans; `page`, Bob keyset pagination; and `lifecycle`, a service and worker coordinator.
 
-## docs
+## migrate
+
+[`migrate`](migrate/README.md) configures Goose providers for embedded SQL and Go
+migrations, with structured logging and Postgres startup locking.
+
+## corestack-docs
 
 Install:
 
 ```sh
-go install go.auvem.com/corestack/cmd/docs@latest
+go install go.auvem.com/corestack/cmd/corestack-docs@latest
 ```
 
 Use, from a repository root:
 
 ```sh
-docs new adr "Use Example Queue for background jobs"   # creates docs/adr/<id>.md
+corestack-docs new adr "Use Example Queue for background jobs"   # creates docs/adr/<id>.md
-docs new plan "Adopt Example Queue"                    # creates docs/plans/<id>.md
+corestack-docs new plan "Adopt Example Queue"                    # creates docs/plans/<id>.md
-docs check [--root DIR]                                # prints path:line: message; exit 1 on problems
+corestack-docs check [--root DIR]                                # prints path:line: message; exit 1 on problems
 ```
 
 The format is specified in [docs/docs-format.md](docs/docs-format.md); that document is the complete rule set. Exit status is `0` when every record is valid, `1` when problems are reported and `2` for usage errors.
 
+## page
+
+[`page`](page/page.go) provides transport-neutral Bob keyset pagination with typed
+items, mixed-direction sorts, opaque typed cursors, and a separate opt-in count.
+Pass a trusted Sort and a typed row key in the same column order; sort columns
+must be non-null and end in a unique column. See the [runnable example](page/example_test.go)
+and [cursor decision](docs/adr/20261027T184351001Z-preserve-typed-sort-values-in-versioned-page-cursors.md).
+
+SQLite runs in-process in the normal test suite (requires CGO). PostgreSQL runs in
+CI; locally set `PAGE_POSTGRES_DSN` to an isolated test database to run the same
+flow. Set `PAGE_REQUIRE_POSTGRES=1` to fail rather than skip when the DSN is absent.
+MySQL mod composition compiles; its runtime behavior has not been verified.
+
+## lifecycle
+
+`go.auvem.com/corestack/lifecycle` sets up modules in registration order, runs
+services concurrently, and tears down successful setups in reverse order.
+Construct an `App` with a required `*slog.Logger`, register `Module` callbacks,
+and call `Run(ctx)` once. See the [two-service example](lifecycle/example_test.go).
+
+Launch background work with `app.Go(ctx, name, fn)` using the callback's lifecycle
+context or a descendant, and handle admission errors. Run waits for every service
+and admitted worker; raw goroutines remain your responsibility. First failure or
+an injected signal cancels work before teardown. One shared shutdown deadline
+(default 30 seconds) covers hooks and callback completion; a second signal
+abandons shutdown. Callbacks must cooperate: abandonment cannot kill goroutines,
+and the caller owns process exit and any unreleased resources.
+
+During App-initiated shutdown, callback errors containing only the callback's
+context cancellation are omitted. Mixed cancellation and independent failures
+are retained intact to preserve wrapper types, identity and custom matching;
+these errors may still match cancellation through `errors.Is`.
+
+The caller owns signal subscription, SIGINT/SIGTERM filtering, a channel buffered
+for at least two signals, and subscription cleanup. Nil signals disable reception.
+There are no signal subscriptions, process exits, external dependencies or CLI
+integration in this package.
+
+## lifecycle/cli
+
+`go.auvem.com/corestack/lifecycle/cli` adapts native `urfave/cli/v3` commands.
+Bind `Serve(config, modules)` to run selected services, or `Action(config, modules,
+fn)` for a one-off with selected setup/cleanup and module services suppressed.
+See the [executable serve/inspect example](lifecycle/cli/example_test.go).
+
+`Run(ctx, cliRoot, args)` accepts argv including the program name and returns the
+exit code and inspectable error: success/help/graceful first signal is 0, usage is
+2, and runtime/lifecycle failure is 1. Runtime failures dominate mixed errors.
+Run prints diagnostics without exiting; the caller owns process exit. Nil signals
+subscribe to SIGINT/SIGTERM during adapted actions; injected channels stay caller
+owned. The private lifecycle App does not expose managed-worker admission.
+
+Use fresh command trees and leave `ExitErrHandler`, `OnUsageError` and
+`CommandNotFound` unset; Run owns those hooks. Other native hooks run outside the
+adapted lifecycle action. Native environment/custom validation and generated-help
+parse failures can return 1 with native diagnostics; custom pre-lifecycle
+validators may return `urfavecli.Exit(err, 2)` for usage. Help and flags use native
+urfave/cli declarations, without a configuration or environment facade.
+
 ## Status
 
 No support is guaranteed. Breaking changes, including to the format rules, may happen before 1.0 and are listed in the release notes.

cmd/corestack-docs/main.go

@@ -1,4 +1,4 @@
-// Command docs creates and checks ADR and plan records. See docs/docs-format.md.
+// Command corestack-docs creates and checks ADR and plan records. See docs/docs-format.md.
 package main
 
 import (
@@ -12,8 +12,8 @@ import (
 )
 
 const usage = `usage:
-  docs new adr|plan "Title"
+  corestack-docs new adr|plan "Title"
-  docs check [--root DIR]
+  corestack-docs check [--root DIR]
 `
 
 func main() { os.Exit(run(os.Args[1:], os.Stdout, os.Stderr, time.Now())) }
@@ -32,13 +32,13 @@ func run(args []string, stdout, stderr io.Writer, now time.Time) int {
 		}
 		path, err := docs.New(".", args[1], args[2], now)
 		if err != nil {
-			fmt.Fprintf(stderr, "docs: %v\n", err)
+			fmt.Fprintf(stderr, "corestack-docs: %v\n", err)
 			return 1
 		}
 		fmt.Fprintln(stdout, path)
 		return 0
 	case "check":
-		fs := flag.NewFlagSet("docs check", flag.ContinueOnError)
+		fs := flag.NewFlagSet("corestack-docs check", flag.ContinueOnError)
 		fs.SetOutput(stderr)
 		root := fs.String("root", ".", "repository root")
 		if err := fs.Parse(args[1:]); err != nil || fs.NArg() != 0 {
@@ -49,7 +49,7 @@ func run(args []string, stdout, stderr io.Writer, now time.Time) int {
 		}
 		res, err := docs.Check(*root)
 		if err != nil {
-			fmt.Fprintf(stderr, "docs: %v\n", err)
+			fmt.Fprintf(stderr, "corestack-docs: %v\n", err)
 			return 1
 		}
 		for _, p := range res.Problems {

docs/adr/20261023T214738672Z-adopt-a-checked-format-for-adrs-and-implementation-plans.md

@@ -80,3 +80,5 @@ The format is specified in [docs-format](/docs/docs-format.md). It uses the MADR
 ## More Information
 
 MADR 4: https://adr.github.io/madr/. The specification is [docs-format](/docs/docs-format.md); the implementation lands in the same pull request that records this decision.
+
+Note (2026-10-28): the CLI was renamed from `docs` (`cmd/docs`) to `corestack-docs` (`cmd/corestack-docs`) so `go install` does not produce an ambiguous `docs` binary. The decision is unchanged.

docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md

@@ -0,0 +1,55 @@
+---
+title: "Version light core packages in the root module and nest heavy-dependency modules"
+date: 2026-10-25
+status: accepted
+implementation: implemented
+summary: Keep light core packages on root-module versions and isolate heavy or independently versioned packages in nested modules from their first commit.
+tags:
+  - modules
+  - versioning
+supersedes: []
+superseded_by: []
+related: []
+tracking:
+  - https://gitea.auvem.com/corestack/go/issues/2
+implemented_by:
+  - https://gitea.auvem.com/corestack/go/pulls/4
+---
+
+# Version light core packages in the root module and nest heavy-dependency modules
+
+## Context and Problem Statement
+
+The repository currently has one Go module, `go.auvem.com/corestack`. A plain `vX.Y.Z` tag versions every package in that module together and triggers a release of the `docs` binary. Light core packages can share this version stream and one changelog per tag; packages with heavy dependencies or independent release needs benefit from their own module boundaries.
+
+Carving a package out after it has shipped in the root module is the expensive case: older root versions still contain it, while the new nested module supplies the same import path. Consumers can encounter ambiguous imports until coordinated releases and dependency upgrades remove the overlap. Starting a package as a nested module from its first commit avoids that migration.
+
+The fixed dependency list in AGENTS.md described only the docs checker. It would block the planned Bob and Goose dependencies for `page` and `migrate`; dependency placement needs a module-boundary rule instead of a repository-wide allowlist.
+
+## Considered Options
+
+* Keep every package in the root module: simplest releases, but couples heavy and independently versioned packages to core releases and makes later extraction costly.
+* Give every package a nested module immediately: avoids later extraction, but adds module and release bookkeeping to light core packages that can share a version.
+* Keep light core packages in the root module and start heavy or independently versioned packages as nested modules: retain simple core releases while avoiding the costly extraction case.
+
+## Decision Outcome
+
+Choose the mixed boundary: light core packages share the root module; heavy-dependency or independently versioned packages begin as nested modules.
+
+* Root module, plain `v*` tags: `lifecycle`, `lifecycle/cli`, `migrate`, `page`, and `cmd/docs`. They share one version stream and one changelog per root tag. Before 1.0, breaking changes use minor version bumps.
+* Nested modules from their first commit: `gql`, `connect`, and any future package that brings heavy dependencies, such as gqlgen or protobuf, or is likely to need independent versioning. Each has its own `go.mod` and directory-prefixed tags, for example `gql/v0.1.0` and `connect/v0.1.0`.
+* Add dependencies only to the module that needs them. The named core packages remain in the root module; heavy dependencies belong in the relevant nested module.
+* Keep `cmd/docs` in the root module. The [release workflow](/.gitea/workflows/release.yml) listens only for plain `v*` tags, and [GoReleaser](/.goreleaser.yaml) builds `./cmd/docs`, so only root-module tags publish binaries. Prefixed library tags never publish binaries.
+
+This decision establishes the boundary before the planned packages are added. The rule is implemented in [AGENTS.md](/AGENTS.md), and the existing release configuration already follows it. Future packages apply the rule when introduced; no empty modules are needed.
+
+### Consequences
+
+* Light core packages retain coordinated versions and releases. Consumers do not compile dependencies of packages they do not import; module graph pruning helps limit the dependency graph they load.
+* Heavy-dependency and independently versioned packages avoid overlapping ownership of an import path with older root-module versions.
+* Each nested module needs its own dependency maintenance, checks, and prefixed release tags. That bookkeeping is reserved for packages that need the boundary.
+* Root-module consumers share version bumps even when only another core package changes. Moving a shipped root package into a nested module later still requires coordinated releases and consumer upgrades.
+
+## More Information
+
+Note (2026-10-28): `cmd/docs` was renamed to `cmd/corestack-docs`; read references to `cmd/docs` above as `cmd/corestack-docs`. The decision is unchanged.

docs/adr/20261027T184038082Z-supervise-module-lifecycle-and-managed-workers-within-one-shutdown-budget.md

@@ -0,0 +1,75 @@
+---
+title: "Supervise module lifecycle and managed workers within one shutdown budget"
+date: 2026-10-27
+status: accepted
+implementation: implemented
+summary: Order module startup and reverse cleanup while supervising services and background workers under one bounded shutdown.
+tags:
+  - lifecycle
+supersedes: []
+superseded_by: []
+related:
+  - /docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
+tracking:
+  - https://gitea.auvem.com/corestack/go/issues/5
+implemented_by:
+  - https://gitea.auvem.com/corestack/go/pulls/13
+---
+
+# Supervise module lifecycle and managed workers within one shutdown budget
+
+## Context and Problem Statement
+
+[Issue 5](https://gitea.auvem.com/corestack/go/issues/5) needs ordered startup and supervised concurrent services for Lark Relay's daemons and muxer. Its [follow-up](https://gitea.auvem.com/corestack/go/issues/5#issuecomment-7805) also requires explicit coordination of background workers: canceling service contexts alone cannot establish that the entire app has stopped.
+
+The owner approved a standard-library-only root package, registration-order setup, reverse rollback/teardown, injected signals and logging, joined errors, and one configurable shutdown budget (default 30 seconds) covering teardown and worker completion. Cancellation precedes teardown, which may unblock workers; a second signal abandons shutdown. The owner accepted the API and ownership details after independent review, including the R1/R2/R3 clarifications. It is a clean-room design; no go-toolkit/app source is used.
+
+## Considered Options
+
+* Keep coordination in each application's main function: least library code, but duplicates signal, rollback and worker ownership rules across the initial consumers.
+* Provide only ordered hooks and service supervision: smaller package, but callers still need a second worker coordinator to satisfy the follow-up and share its shutdown deadline.
+* Provide ordered hooks plus a managed-worker launch method: one owner for cancellation, registration closure, errors and the shutdown budget, without a dependency graph or framework.
+
+## Decision Outcome
+
+Choose the third option in `go.auvem.com/corestack/lifecycle`, sharing root-module versions under the accepted module-boundary decision. No CLI integration, dependency DAG, external dependency, restart policy or UI is included.
+
+The public surface is:
+
+```go
+type Module struct {
+    Name     string
+    Setup    func(context.Context) error
+    Teardown func(context.Context) error
+    Run      func(context.Context) error // optional
+}
+type Config struct {
+    Logger          *slog.Logger
+    Signals         <-chan os.Signal
+    ShutdownTimeout time.Duration
+}
+type App struct { /* private state; no stored context */ }
+func New(config Config) (*App, error)
+func (a *App) Register(module Module) error
+func (a *App) Go(ctx context.Context, name string, fn func(context.Context) error) error
+func (a *App) Run(ctx context.Context) error
+```
+
+The accepted signatures have the following edge semantics:
+
+* `New` requires a non-nil logger; zero timeout selects 30 seconds and negative durations fail. `Register` requires a unique nonempty module name and non-nil setup/teardown. Registration closes when `Run` begins; an App runs once. Invalid or late calls return errors without launching work. Configuration is captured by `New` and modules by `Register`, with no global state or initialization side effects.
+* `Run` sets up modules sequentially in registration order using a shared child of its parent context. Only after every setup succeeds does it launch the optional service callbacks concurrently. Dependencies are expressed by registration order and ordinary Go wiring, not lookup or dependency injection APIs. Service scheduling order is unspecified.
+* `Go` is the explicit tooling for background work. A setup or service callback can capture the App and call `Go`; the supplied context must be that callback's lifecycle context or a descendant. Context ancestry is a caller precondition that App cannot generally enforce; detached contexts forfeit graceful cancellation. It launches `fn(ctx)` immediately, tracks completion and errors, and returns once admitted; admission is atomic with shutdown closure. It is available only during setup/running, accepts a nonempty diagnostic name and non-nil function, and is safe for concurrent callers. Worker names need not be unique. Callers must handle admission errors. Raw goroutines remain the caller's responsibility and cannot be included in the completion guarantee.
+* Once startup completes, normal completion means every service and admitted worker has returned nil; no services/workers means immediate normal shutdown. A nil return from just one service/worker does not stop the others. Normal completion atomically closes worker admission so a racing launch is either tracked or rejected. Before startup completes, temporarily having no workers does not end the run.
+* The first setup/service/worker failure, parent cancellation, or received SIGINT/SIGTERM starts shutdown and closes worker admission. Cancel the shared context first, then tear down successfully completed setups in reverse order while services/workers unwind concurrently. Do not wait for workers before teardown: closing a listener or queue may be what releases them. A failing setup owns cleanup of its partial acquisition and is not torn down by App.
+* One fresh shutdown context retains parent values but is detached from parent cancellation and has the configured deadline, measured from the shutdown trigger. Reverse teardown hooks run sequentially with that context; all admitted services/workers share the same remaining completion budget. An in-flight setup is canceled and awaited only within this budget before reverse rollback, avoiding concurrent setup and teardown. Its successful return before abandonment adds it to rollback; failure does not. No further setup starts after shutdown begins.
+* The deadline or a second signal cancels the shutdown context and returns without starting remaining teardown hooks or waiting further for callbacks. App must observe setup/teardown results asynchronously so an uncooperative hook cannot block its return. App will not later call teardown for an abandoned setup, even if it later succeeds; its acquisitions may leak until caller-owned process exit. A cancellation-aware setup must clean up partial acquisitions and return an error when it observes cancellation. Completion reporting must not block after App returns. Go cannot forcibly kill uncooperative goroutines: the bound covers App's coordination and return, not guaranteed resource release or goroutine termination. Callbacks must honor cancellation, and the caller owns process exit and must not reuse abandoned resources. Injected logging must not block shutdown.
+* The caller owns OS signal subscription, filtering to SIGINT/SIGTERM, buffering (at least two), and subscription cleanup. App only receives from the injected channel, never closes it or calls `signal.Notify`, `signal.Stop`, or `os.Exit`. Nil disables signals and a closed channel is disabled. If shutdown began for another reason, the first subsequently received signal counts as the first signal; the next abandons shutdown. Signal counting spans startup and shutdown.
+* Wrap callback failures with module/worker name and phase and combine observed errors using `errors.Join`; retain every completed teardown error, including cancellation errors. A setup/service/worker error solely wrapping its callback context's cancellation/deadline caused by an already-established shutdown is expected and omitted; independent failures and non-cancellation components of joined errors remain errors. An instance-private cancellation cause proves App-initiated cancellation; retain ambiguous parent-propagated cancellation conservatively, including independently canceled descendants. The runtime context remains a direct child of its parent and preserves its deadline. The initiating setup failure remains an error. Parent cancellation returns its context error; graceful signal/normal completion returns nil if cleanup succeeds. Deadline abandonment adds `context.DeadlineExceeded`; signal abandonment adds an error wrapping `context.Canceled` with the signal as context. Retain errors already observed on abandonment, with no promise to collect later results or deterministic concurrent-error order. Do not recover panics.
+
+### Consequences
+
+* One coordinator owns admission, cancellation, hook ordering and completion accounting. Applications must route background work through `Go` and supply cooperative callbacks to claim graceful whole-app completion; this is an explicit boundary, not automatic goroutine discovery.
+* The shutdown bound requires asynchronous hook invocation and synchronized worker admission/completion, even when a consumer has no background workers. A blocked hook can consume the entire budget and leave earlier modules without teardown; a second signal deliberately accepts that same incomplete cleanup sooner.
+* Delivery should remain approximately 300–500 production lines plus focused race tests, a two-service package Example and public/package docs, in one PR. Verify startup/reverse ordering, partial rollback, service and worker failure propagation, normal completion, cancellation/error classification (including a first signal during setup with successful partial cleanup and rollback returning nil, and an initiating setup failure remaining observable), admission races, teardown unblocking workers, a shared deadline (including an uncooperative hook), second signals and joined errors. Test with injected signals, release blocked test goroutines explicitly, and use no real process signals.
+* No plan tier is needed. The accepted decision is implemented by [PR 13](https://gitea.auvem.com/corestack/go/pulls/13), including managed workers, bounded shutdown, focused race tests, the two-service example and public documentation. Independent standard and high implementation reviews are complete with no outstanding findings, and required local checks passed on the reviewed code. Publication is complete; CI and merge readiness are tracked in the PR. Delivery was reconciled against main at `46c4416ed44b4c8cfc69570b9bcb572b624d765e` plus the PR; this records implementation evidence, not a merge or release.

docs/adr/20261027T184351001Z-preserve-typed-sort-values-in-versioned-page-cursors.md

@@ -0,0 +1,91 @@
+---
+title: Preserve supported value types in versioned page cursors
+date: 2026-10-27
+status: accepted
+implementation: implemented
+summary: Pair a plain sort with a typed row key function and preserve supported concrete values with tagged cursors.
+tags:
+  - pagination
+  - cursors
+supersedes: []
+superseded_by: []
+related:
+  - /docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
+tracking:
+  - https://gitea.auvem.com/corestack/go/issues/6
+implemented_by:
+  - https://gitea.auvem.com/corestack/go/pulls/15
+---
+
+# Preserve supported value types in versioned page cursors
+
+## Context and Problem Statement
+
+[Issue 6](https://gitea.auvem.com/corestack/go/issues/6) requires transport-neutral, non-null keyset pagination through Bob query mods. Cursors may be retained by callers, so their format is a compatibility contract. The owner requires two plain query inputs: a Sort and a typed `func(T) []any` returning column values in sort order. No reflection, struct tags, field lookup or per-column getters may connect rows to columns. Future code generation may produce both values; v0 must work with handwritten values.
+
+Type preservation here means retaining each supported concrete value across encoding/decoding and passing that value to Bob's argument binder. It does not mean statically proving the agreement between independent Sort and key values. JSON decoded into untagged `any` would lose integer precision and concrete types.
+
+## Considered Options
+
+* Plain Sort/key values with explicit tagged scalar encoding: meets the requested API and preserves a documented finite set without reflection.
+* Untagged JSON decoded into `[]any`: smaller, but numbers become float64 and concrete type information disappears.
+* Per-column generic extractors or caller-defined generic cursor tuples: can tie values to columns more strongly, but do not match the owner's chosen two-value API.
+* Reflection, codec registration or arbitrary serialized Go objects: broadens the supported set at the cost of machinery and compatibility obligations not needed for v0.
+
+## Decision Outcome
+
+Use plain Sort/key inputs with tagged JSON, wrapped in unpadded base64url (`base64.RawURLEncoding`). The owner accepted this reviewed design on 2026-10-27, including the two-input API and continuation flags. [PR 15](https://gitea.auvem.com/corestack/go/pulls/15) delivers the implementation, SQLite/PostgreSQL outcome tests and package example. Local build, vet, race tests with real PostgreSQL, pinned lint, TODO and documentation checks passed; independent Standard review's Minor fixture finding was fixed, and fresh High review of `927594b` found no Blocking, Major or Minor findings. Published-head CI remains a merge-readiness gate reported in the PR; this implementation state does not assert CI success, merge or release.
+
+Sort contains a stable caller-owned ID and an ordered list of columns, each with a Bob expression, direction and unique marker. Reject empty sorts, a missing or invalid UTF-8 Sort ID, nil expressions, invalid directions and a missing unique marker on the final column. Columns have no redundant ID field. The marker asserts that column alone is unique in the selected relation under database collation/comparison semantics, including joins. The library cannot prove schema truth. Composite-only uniqueness is outside the issue's final unique-column contract. Expressions and IDs come from trusted application declarations, never cursor-controlled SQL. The sort ID identifies the full immutable interpretation: ordered expressions, directions, key types, uniqueness and comparison semantics. Changing any of these requires a new ID. The backend selects the expected trusted Sort for the query; a decoded token ID must equal its ID. There is no global registry, descriptor fallback or hash subsystem. Local column metadata remains available for validation and query generation; it is not repeated on the wire.
+
+A typed key function returns values in exactly that order. Check `len(key(row)) == len(sort.Columns)` for every returned row used to assemble a page, including the fetched extra row. A mismatch returns a clear programmer-error `KeyError` with expected/actual lengths; never truncate, zip a prefix or emit a bad cursor. Reject nil key functions. Column/value correspondence remains an explicit caller contract; no field discovery or hidden mapping is introduced.
+
+Cursor v1 contains only version, sort ID and ordered typed values. Each value is exactly a two-element `[typeTag,payloadString]` array. Example decoded JSON:
+
+```json
+{"v":1,"sort":"orders/recent/v1","values":[["time","2026-10-27T12:00:00Z"],["int64","9007199254740993"]]}
+```
+
+For this exact example, compact JSON is 105 bytes and its unpadded base64url token is 140 bytes; the prior descriptor/object format was 242 and 323 bytes respectively. All tags and payloads are strings. Fixed type tags distinguish `int`, `int8`, `int16`, `int32`, `int64`, `string`, `time` and `uuid`. A type switch encodes exactly these concrete Go types; a fixed switch reconstructs them using range-checked integer parsing, valid UTF-8 strings, `time.Time` via RFC3339Nano, and standard-library `uuid.UUID` via canonical lowercase dashed text. Integer decimal text is canonical and never passes through float64. `int` must fit the consuming platform. Normalize timestamps to UTC before RFC3339Nano encoding, preserving the instant and nanoseconds, not monotonic metadata or named timezone identity; reject years unrepresentable in RFC3339 with a typed `ValueError`. Reject invalid UTF-8 rather than silently replacing bytes.
+
+UUID support specifically means Go 1.27.1's standard `uuid.UUID`: its Parse/String methods support this representation and database/sql's default converter converts it to a string for drivers. Third-party UUID types require explicit caller conversion to this type. Named user-defined scalar types, unsigned integers, floats, booleans, pointers, nullable wrappers, byte slices and arbitrary custom types return a typed `ValueError`; no reflection, implicit coercion, custom binder or registry is proposed. A true Go type alias retains its underlying supported identity. Additional types require an explicit format/support decision. V0 sort columns must be non-null and ordered consistently by WHERE and ORDER BY; callers extract actual stored/scanned values, including timestamp precision.
+
+Apply the same maximum of 16 KiB (16,384 bytes) to both emitted and received tokens, measured after final unpadded base64url encoding, including the full envelope. Check received token bytes before decoding, and decode before constructing a mod. Encoding a key or envelope that cannot fit returns a typed `CursorError` and no partial Page. Reject bad base64/JSON, unknown/duplicate/missing envelope fields (only `v`, `sort` and `values` are allowed, so `columns` is rejected), trailing data, version mismatch, a sort ID unequal to the expected Sort ID, wrong value count, nulls, non-array value entries, pairs of any arity other than two, non-string tags/payloads, unknown tags and invalid/range-overflowing payloads. The outer `values` array must contain exactly `len(sort.Columns)` pairs; the former type/value objects are rejected. An exported `CursorError`, inspectable with `errors.As`, distinguishes malformed, version, sort and unsupported-value failures. Encoding unsupported key values returns `ValueError` identifying the position and type, without leaking values. Keys and token shape are validated before producing a Page; errors return no partial page. Cursors are not authenticated: a well-formed edit to a supported value or tag remains a seek request, not a tamper-detection failure. Without expected type metadata in Sort, the library cannot prove an edited supported tag matches a SQL column; driver/database errors propagate normally. Authorization stays in the query.
+
+Prepared pagination exposes one generic Bob `Mod[Q]` targeting native `AppendWhere(...any)`, `AppendOrder(bob.Expression)` and `SetLimit(any)` methods shared by PostgreSQL, SQLite and MySQL SelectQuery. Use Bob expressions and `clause.OrderDef`, fixed operators/directions, and an integer limit. Prepare validates requests/cursors first because ordinary Bob Apply has no error return. Cursor values only enter `expr.Arg(value)`; Bob's existing `any` boundary retains their concrete dynamic type. No custom SQL renderer is needed. Apply once to a query without ORDER BY, LIMIT, OFFSET or FETCH; callers may append their dynamic/authorization filters but must not override pagination/order.
+
+For `(created DESC, id ASC)`, after means `created < c OR (created = c AND id > i)`, grouped as one WHERE condition. Before reverses each comparison. Backward also reverses each ORDER BY direction, fetches limit+1, trims overflow, then reverses retained rows into canonical order. Page[T] holds Items, StartCursor, EndCursor, HasNext and HasPrevious; cursors describe the canonical first/last returned items, or are empty when no items exist. Deleted anchors remain value boundaries. Writes or changed filters between requests may skip/repeat items; no snapshot is promised.
+
+Forward maps first/after and Backward maps last/before to a transport-neutral Direction, Size and Cursor request. Request rules: zero direction is Forward, zero/absent size uses configured default, negative sizes and invalid directions fail, oversized sizes clamp to maximum; require `1 <= default <= maximum` and overflow-safe limit+1. Empty cursor means no anchor. The owner selected continuation semantics: forward HasNext=overflow and HasPrevious=nonempty after; backward HasPrevious=overflow and HasNext=nonempty before. This applies even to empty/stale results. An anchor-derived opposite flag does not prove rows exist; no extra existence probes are required.
+
+Bob v0.50.0 distinguishes generated column references from generated typed WHERE helpers. Generated references such as `models.Orders.Columns.CreatedAt` (schematic; this repository has no generated models) satisfy `bob.Expression` and can replace handwritten `expr.Quote` identifiers in Sort. Their generated per-table column type embeds the dialect Expression and has no Go value-type parameter: neither reference nor `expr.Quote` statically links that expression to a `time.Time` key. In contrast, generated `models.SelectWhere.Orders.CreatedAt` uses `WhereMod[Q, time.Time]`; its `EQ`/`LT`/`GT` arguments must be assignable to `time.Time`, and Q must satisfy Bob's Filterable constraint. These helpers produce WHERE mods, not sortable column expressions, and expose no public expression accessor. They cannot be substituted directly for Sort expressions or consume a heterogeneous `[]any` element without recovering the expected concrete type. The chosen API preserves the concrete dynamic values through the codec/binder and checks lengths at runtime; it promises no compile-time column/key type or order agreement. The owner deferred stronger compile-time field correspondence to [code generation issue 11](https://gitea.auvem.com/corestack/go/issues/11); no code generation or stronger typed abstraction is implemented here.
+
+A concrete call shape using schematic Bob-generated references is (this repository has no generated models):
+
+```go
+sort := page.Sort{ID: "orders/recent/v1", Columns: []page.Column{
+    {Expression: models.Orders.Columns.CreatedAt, Direction: page.Desc},
+    {Expression: models.Orders.Columns.ID, Direction: page.Asc, Unique: true},
+}}
+key := func(o Order) []any { return []any{o.CreatedAt, o.ID} } // time.Time, int64
+prepared, err := page.Prepare(sort, key, page.Request{
+    Direction: page.Forward, Size: 25, Cursor: after,
+}, page.Limits{Default: 25, Maximum: 100})
+// Handle err before applying the mod to a normal Bob PostgreSQL SELECT q.
+q.Apply(page.Mod[*pgdialect.SelectQuery](prepared))
+q.Apply(sm.Where(psql.Quote("orders", "tenant_id").EQ(psql.Arg(tenantID))))
+// Execute q with Bob's normal Order mapper, obtaining up to 26 []Order rows.
+result, err := prepared.Page(rows)
+```
+
+Backward changes Direction and supplies the before cursor. `pgdialect`/`sm` are Bob's PostgreSQL dialect/select-mod packages; corresponding SQLite/MySQL select types use the same mod. `Page` retains the typed `Order` key function; `o.ID` is restored as int64, including above 2^53. A separate opt-in `Count(ctx, executor, callerBuiltCountQuery)` executes an explicitly counting, authorized unpaginated Bob query. It never guesses how to strip pagination or count grouped/distinct caller relations.
+
+Bob v0.50.0 is source-feasible for all three dialects, with two reported limitations: generic `mods.OrderBy` expects a different AppendOrder signature from actual selects (native ModFunc matches); MySQL's select writer discards LIMIT expression arguments (use the normal native integer LIMIT API, while cursor WHERE values remain bound). SQLite runs in-process in the normal test suite. PostgreSQL uses the same pagination outcome suite and a required CI service container. MySQL has compile-time native mod composition coverage; runtime behavior remains unverified. Bob belongs in the root module under the accepted module-boundary ADR; no UUID dependency is needed. No persistence, writers, migrations, secrets, workers or timers are introduced.
+
+### Consequences
+
+* The owner-chosen Sort/key separation is simple and code-generation-ready, with runtime length errors instead of compile-time column/value agreement. Tests and package examples must demonstrate correct pairing and disagreement failures.
+* Explicit tags retain supported concrete types without reflection, precision loss or a registry. Unsupported custom/third-party types require explicit caller conversion or a later support decision.
+* Version and sort IDs become compatibility commitments; changes may deliberately reject retained cursors. No legacy decoder is needed before another version exists.
+* Cursors expose values and permit valid edits; queries, counts and every request must preserve authorization. Concurrent writes have no snapshot guarantee. Nothing runs when unused.
+* Implementation tests must cover tagged round trips (including large integers, time with an unusual second-offset timezone, and UUID), unrepresentable timestamp years, encoded-token boundaries at and above 16 KiB for both emission and receipt, oversized-string rejection with a typed error and no partial Page, unsupported/malformed/tampered/mismatched cursors (including removed `columns` fields, object-shaped values, incorrect pair arity and non-string entries), Sort/key disagreement, mixed-direction ties, both directions, boundaries and size clamping, plus a package Example of the key function. Execute our pagination and compliant binding/composition tests on in-process SQLite and PostgreSQL CI; do not assert Bob SQL formatting/rendering guarantees. MySQL remains source-feasible until runtime coverage exists.

docs/adr/20261028T210148136Z-run-native-urfave-commands-inside-selected-lifecycle-modules.md

@@ -0,0 +1,104 @@
+---
+title: "Run native urfave/cli commands inside selected lifecycle modules"
+date: 2026-10-28
+status: accepted
+implementation: implemented
+summary: Use native urfave/cli commands and flags with thin lifecycle action adapters and an explicit exit boundary.
+tags:
+  - lifecycle
+  - cli
+supersedes: []
+superseded_by: []
+related:
+  - /docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
+  - /docs/adr/20261027T184038082Z-supervise-module-lifecycle-and-managed-workers-within-one-shutdown-budget.md
+tracking:
+  - https://gitea.auvem.com/corestack/go/issues/8
+implemented_by:
+  - https://gitea.auvem.com/corestack/go/pulls/16
+---
+
+# Run native urfave/cli commands inside selected lifecycle modules
+
+## Context and Problem Statement
+
+[Issue 8](https://gitea.auvem.com/corestack/go/issues/8) needs command-specific resource setup, signal-aware work, cleanup on completion, automatic help and distinct usage failures. The owner selected `github.com/urfave/cli/v3` v3.14.0 for every command, subcommand, flag and help surface; callers declare native flags. One-offs skip module services; serve runs them. The root-module boundary and lifecycle ordering, cancellation and shared shutdown budget already stand. This clean-room implementation uses no go-toolkit/appcli source.
+
+The owner accepted the three-function API, adapter-owned signal subscription, private invocation App boundary, native validation limitations and generated-help diagnostic/exit exceptions after independent review. The corrected decision was verified at [commit 1b756511](https://gitea.auvem.com/corestack/go/commit/1b7565113c20757c8a049fe44e9a035cf72fd4b7), with R1–R3 addressed and no blocking or major findings; the implementation dispatch explicitly records owner acceptance. Implementation is published in [PR 16](https://gitea.auvem.com/corestack/go/pulls/16) after independent standard and fresh high implementation reviews with no outstanding findings.
+
+## Considered Options
+
+* Native urfave/cli command tree with action adapters: shares native flags/help and existing lifecycle coordination; adds only selection, signal ownership and exit classification.
+* A new command/flag schema wrapping urfave/cli: could centralize declarations, but duplicates its API and increases conversion and maintenance obligations without a requested capability.
+* Standard-library flag parsing: smaller dependency graph, but would require our own subcommands/help and contradict the owner's dependency choice.
+* Per-binary urfave/cli and lifecycle wiring: no library API to maintain, but repeats signal cleanup, one-off service suppression and exit policy in each consumer.
+
+## Decision Outcome
+
+Choose the first option in root package `go.auvem.com/corestack/lifecycle/cli`, with no lifecycle core change. Import urfave/cli as `urfavecli` to distinguish its native types from this package. The entire new public surface is:
+
+```go
+// Run executes a caller-owned native tree and returns its process code and error.
+// It prints diagnostics but never exits the process; args includes argv[0].
+func Run(ctx context.Context, cliRoot *urfavecli.Command, args []string) (int, error)
+
+// Serve returns an action running exactly these modules, including their services.
+func Serve(config lifecycle.Config, modules []lifecycle.Module) urfavecli.ActionFunc
+
+// Action returns a one-off action using exactly these modules, without services.
+func Action(config lifecycle.Config, modules []lifecycle.Module,
+    fn urfavecli.ActionFunc) urfavecli.ActionFunc
+```
+
+The functions capture module declarations in their supplied order; callers list every needed module explicitly. There is no registry, name lookup, implicit dependency expansion or DAG. Callbacks close over caller-owned resource handles populated by Setup; the one-off receives the selected native command for parsed flag access. There is no public App, worker method, configuration framework or flag/environment facade. Empty module lists are valid. Nil one-off functions, nil Run context/root, invalid lifecycle config and invalid selected modules are runtime errors before resource acquisition; validate every selected declaration before starting setup. Bindings do not start work until invoked. A command tree and its mutable resources have one execution owner; construct fresh trees for independent runs and do not mutate captured declarations concurrently.
+
+`Serve` constructs a fresh lifecycle App, registers selected modules and calls its Run. `Action` copies selected modules with Run cleared, then registers an internal final module with no-op Setup/Teardown and the command function as Run. Choose its nonempty name by checking all selected names and varying a private suffix until unused; no public module name is reserved. All selected setups precede work; returning from the one-off leaves no selected services to keep the App alive. Lifecycle closes admission, cancels the callback context and performs reverse cleanup. No success sentinel, cancellation-error filtering, parent-context cancellation or second shutdown timer is added. Action failures are lifecycle failures and preserve their chains. Core setup failure/partial cleanup, parent cancellation, second signal, abandonment and joined-error behavior remain authoritative. Selected module services cannot run during one-offs. The invocation App is private: modules or callbacks that need its App.Go cannot obtain it through these adapters and are incompatible with this narrow API. Capturing another App does not confer this invocation's supervision. Supported modules manage resources and optional services without that access; raw goroutines remain caller-owned and outside managed-worker completion. Exposing worker access would require a separate owner decision.
+
+Each invoked adapter subscribes to SIGINT/SIGTERM using a private channel buffered for two signals when Config.Signals is nil, and defers signal.Stop. With a supplied channel, subscription, filtering and cleanup remain caller-owned as in lifecycle; a closed supplied channel disables signals. The adapter never closes either channel. No subscription or relay goroutine is needed during parsing/help. Lifecycle alone consumes/counts signals and cancels command work; do not also use signal.NotifyContext, which would turn graceful Ctrl-C into parent cancellation. After adapter return, subscription cleanup restores the prior process signal behavior; the caller owns process exit and abandoned resources.
+
+Run owns the tree's ExitErrHandler, OnUsageError and CommandNotFound hooks, rejecting conflicting caller hooks as runtime configuration errors rather than silently overriding them. It installs a non-exiting root handler and usage/not-found handling on the caller-declared tree before urfave/cli runs; no urfave/cli package globals are changed. CommandNotFound returns void, so its callback records a local usage cause for this invocation; Run combines that cause with the native result even when urfave/cli returns nil, retaining any simultaneous runtime error. Native actions, Before/After, ArgValidator, flags, arguments and help templates remain caller declarations. Hooks outside the lifecycle action are outside its signal/shutdown/resource guarantee: use them for prompt validation, and put resource work inside selected modules or the adapted action. Leave group Actions unset for native group help/unknown-command handling; positional arguments on actionable leaves follow native urfave/cli declarations and validators.
+
+The exit mapping is:
+
+| Result | Code |
+| --- | --- |
+| No returned or locally recorded error, including valid help, empty group help, normal completion or graceful first signal with successful cleanup | 0 |
+| Lifecycle setup/action/service/teardown error, parent cancellation, budget/second-signal abandonment, or other unclassified native error | 1 |
+| Native OnUsageError path on caller-declared commands (invalid/missing flag value, required flag/argument, mutually exclusive flags, native argument parsing), or locally recorded unknown command/help topic | 2 |
+| Parse failure in a urfave/cli-generated help command, including its aliases | 1 |
+| Explicit `urfavecli.Exit(err, 2)` from pre-lifecycle caller validation | 2 |
+
+A lifecycle failure always remains code 1, including action-returned ExitCoder values and joins containing cleanup failures; do not infer success by matching context.Canceled. Non-2 ExitCoder values outside lifecycle normalize to 1; an error never becomes success through ExitCode 0. Use private provenance wrappers for usage and lifecycle failures. Native After hooks may aggregate failures in urfavecli.MultiError, whose Errors() children are invisible to standard traversal. A small private bridge traverses both standard Unwrap forms and native MultiError.Errors(), recursively exposing children through Unwrap() []error while also retaining each original error/wrapper as a traversal child. It delegates Error() to the original rather than duplicating its text. Do not flatten or replace native wrappers: errors.Is must still match their identity and errors.As must still find their types, alongside nested causes and private markers.
+
+Classify every semantic branch, carrying its usage/lifecycle provenance through wrappers and aggregates; aggregate containers are not extra unclassified failures. Any lifecycle branch or unclassified runtime branch dominates usage branches, including an Exit(err, 2) action plus failing After, usage plus runtime After, and nested parent/leaf After failures. Looking up only the first ExitCoder or marker is insufficient. Run returns the traversable error after cleanup and emits at most one adapter-owned final diagnostic to cliRoot.ErrWriter. This is not a single total diagnostic guarantee: native help parse handling and caller hooks may also print. Usage hooks request relevant native help through urfave/cli's Show*Help functions. Native help goes to cliRoot.Writer and diagnostics to cliRoot.ErrWriter, defaulting to stdout/stderr; callers may supply writers there. No logger/writer registry or logging policy is added. Rendering retains urfave/cli's own writer-error behavior, without promising stronger delivery guarantees.
+
+Accepted owner exception: urfave/cli creates generated help nodes lazily after the pre-run hook walk; their parse failures bypass OnUsageError. Accept code 1 with native diagnostics for malformed generated help invocations (root, nested and aliases); Run's final diagnostic may repeat the native error. Valid help remains code 0, and unknown help topics remain code 2 through the recorded CommandNotFound cause. Uniform code 2 and one total diagnostic would require separate feasibility evidence and owner approval. Do not initialize by reparsing, copy native parser/help code, or detect diagnostics through error strings.
+
+urfave/cli v3.14.0 does not expose all validation errors through OnUsageError: invalid environment values in Flag.PostParse bypass it, as do ArgValidator and flag-action errors. Unclassified errors from those paths are code 1. Callers needing code 2 from custom validators return `urfavecli.Exit(err, 2)` before lifecycle entry; native environment-source failures remain code 1 unless the caller validates explicitly. Do not inspect error strings, reparse arguments, wrap every flag type or promise universal parse/runtime discrimination.
+
+A schematic consumer uses ordinary Go wiring; the implementation Example must be executable and show both modes:
+
+```go
+cfg := lifecycle.Config{Logger: logger}
+cliRoot := &urfavecli.Command{Name: "app", Commands: []*urfavecli.Command{
+    {Name: "serve", Action: cli.Serve(cfg, []lifecycle.Module{database, server})},
+    {Name: "inspect", Flags: []urfavecli.Flag{&urfavecli.BoolFlag{Name: "verbose"}},
+        Action: cli.Action(cfg, []lifecycle.Module{database},
+            func(ctx context.Context, cmd *urfavecli.Command) error {
+                return inspect(ctx, db, cmd.Bool("verbose"))
+            })},
+}}
+code, err := cli.Run(context.Background(), cliRoot, os.Args)
+_ = err // already diagnosed; available for inspection by an embedding caller
+os.Exit(code) // caller-owned process boundary, after all adapter cleanup
+```
+
+The dependency belongs in root go.mod/go.sum under the accepted boundary ADR. At v3.14.0 `go list -deps` reports no nonstandard production package except urfave/cli itself; its [module requirements](https://github.com/urfave/cli/blob/v3.14.0/go.mod) are for tests, with YAML already present here. This is a small CLI dependency, not a reason to introduce a nested module. The native exported types deliberately couple consumers to urfave/cli v3; we own integration tests when upgrading it.
+
+### Consequences
+
+* Scope is one PR, approximately 200–350 production lines plus focused tests and docs: new lifecycle/cli/cli.go (package/public comments and adapters), cli_test.go, example_test.go, root go.mod/go.sum and this ADR. No existing callers, fixtures, lifecycle core, migration package, release/config framework or GUI changes are anticipated. The reusable migration command belongs exclusively to issue 9.
+* There are no persistence writers, migrations, remote services, new auth boundaries or persistent workers. Active work consists of lifecycle-owned callbacks, its existing shutdown deadline, and a temporary OS signal subscription only while an adapted action executes. Callers own command output, cooperative callbacks, partial setup cleanup and eventual process exit; importing the package starts nothing.
+* Tests must prove selected-only setup and registration/reverse order, no one-off services, teardown on success/failure, serve services, fixed code mapping with preserved typed causes and mixed cleanup errors, native flags/subcommands/help without module setup, invalid environment classification, injected first/second signals, parent cancellation and the shared deadline. Test with injected channels and explicitly release blocked goroutines; do not send real signals. Exercise native callbacks returning ExitCoder without process exit. Add focused action/lifecycle-plus-After, usage-plus-runtime-After and nested After tests asserting code 1, original wrapper identity/types and all child causes. Cover root/nested generated help parse errors and aliases (code 1/native diagnostics), valid help (code 0), unknown commands/help topics returning native nil (code 2), and synthetic-name collisions without reserving names.
+* Native [aggregation and parse handling](https://github.com/urfave/cli/blob/v3.14.0/command_run.go), [MultiError API](https://github.com/urfave/cli/blob/v3.14.0/errors.go) and [lazy help setup](https://github.com/urfave/cli/blob/v3.14.0/command_setup.go) establish integration obligations; they do not alone verify adapter behavior. Retain these cases in upgrade tests. The simpler alternative is narrower hook support; retaining native hooks with a small traversal bridge preserves the requested cause guarantees. Accepting the generated-help exception avoids a second parser/help subsystem.
+* Independent ADR review and owner acceptance are complete. The three adapters, focused tests, executable serve/inspect example and public documentation are implemented in [PR 16](https://gitea.auvem.com/corestack/go/pulls/16). Independent standard and fresh high implementation reviews of `e0673630d5876ece6f2419b4b63ce9f643d5a082` found no Blocking, Major or Minor issues; required local build, vet, race, lint, docs, TODO and formatting checks passed on the reviewed code. Local PostgreSQL integrations skipped without DSNs; final-head CI, PostgreSQL integration evidence and merge readiness are tracked in the PR. Publication is complete, and this record was reconciled against latest `origin/main` at `f0439000cbed0ffdccad0521748bcf1738af4a0c` plus the PR; this records delivery evidence, not CI success, merge or release.

docs/adr/README.md

@@ -0,0 +1,29 @@
+Baseline copied from corestack/standards at a36288e7cec933a32f4819a1308201027c9f57ec; this project owns and may adapt it.
+
+# Documentation policy
+
+The [corestack/go docs-format specification](https://gitea.auvem.com/corestack/go/src/branch/main/docs/docs-format.md) owns record format, templates, and validation. In scaffolded projects, generate records and run checks with the pinned documentation command in the root AGENTS.md; do not maintain local format templates.
+
+The copied policy is a project-owned baseline that the project may adapt; scaffold re-runs never refresh it unless the owner explicitly asks. The project owns its locked checker pin and upgrades: update the tag and ensure compliance; scaffold re-runs retain the existing pin unless the owner asks.
+
+## Choose the smallest useful tier
+
+| Tier | Use when | Scaffold output |
+| --- | --- | --- |
+| Neither | A single-purpose CLI, library, or script has no consequential architectural choice or durable execution context yet. | No record directories and no docs-check CI step; root instructions tell agents to ask the owner to run scaffold-project to enable records when a consequential choice arises. |
+| ADRs only | Consequential choices need durable rationale, but execution fits a short issue or PR. | Local policy in docs/adr/README.md, ADRs as warranted and docs-check CI. |
+| ADRs + plans | Work spans areas, phases, or sessions and needs durable execution context. | Local policy in docs/adr/README.md, a docs/plans/README.md pointer, ADRs as warranted, one file per plan, and docs-check CI. |
+
+Project size is a signal, not an exemption: a small security-sensitive library can warrant an ADR. Add the CI docs-check step exactly when the selected tier enables records. Change tiers when actual work warrants it; do not create empty record directories in anticipation.
+
+## Decisions and execution
+
+Write an ADR for a consequential choice among real alternatives: difficult to reverse, crossing areas, changing a boundary, data model or security posture, or establishing a convention. Routine details and choices already governed by an accepted ADR or practice guide do not need another record. Read relevant accepted decisions and verify their claims against code before dependent work. Proposed ADRs are context, not authority; only the owner accepts a decision.
+
+Write a plan when work spanning areas, phases or sessions needs durable execution context. Otherwise keep planning in a PR, issue or chat. Each plan has its own file; the directory is the index. Never create a central living plan or living PRD checklist that parallel worktrees continually edit. Closed plans are history, never standing instructions.
+
+Use `write-adr` and `review-adr` when available: they guide reasoning while deferring textual format to repository conventions. Seek independent review and owner acceptance before treating a proposal as binding. Neither a self-check nor an independent recommendation accepts an ADR. ADRs may share a PR with implementation; no separate ADR PR or extra sections are required by this policy.
+
+## Reconcile before final review and merge
+
+Compare the latest target branch plus the PR with the affected decisions and plans, not just the working branch's previous metadata. Update ADR implementation state and `implemented_by` with the real PR URL when delivery evidence supports it. Close finished plans with completion evidence and an Outcome; keep work active when scope remains. Never invent PR links, completed checks, owner acceptance, or delivery evidence. Run `corestack-docs check` using the pinned documentation command in the root AGENTS.md after reconciliation.

docs/docs-format.md

@@ -1,6 +1,6 @@
 # Docs format
 
-This is the complete specification for architecture decision records (ADRs) and implementation plans checked by `docs check`. It is standalone: a file that follows this document is valid without running the tool. The words MUST, MUST NOT and MAY are used in their RFC 2119 sense.
+This is the complete specification for architecture decision records (ADRs) and implementation plans checked by `corestack-docs check`. It is standalone: a file that follows this document is valid without running the tool. The words MUST, MUST NOT and MAY are used in their RFC 2119 sense.
 
 The ADR body uses the [MADR 4](https://adr.github.io/madr/) layout; `Consequences` is mandatory. The frontmatter, naming and cross-reference rules are specific to this format.
 
@@ -135,7 +135,7 @@ Heading text is the raw source after the `#` markers, trimmed, with any closing
 
 ### 6.3 Placeholders
 
-A record is invalid if it still contains the exact marker `{{docs:todo}}` anywhere outside code, including inside a frontmatter string value or list item (write it quoted there: `summary: "{{docs:todo}}"`). A list item equal to the marker reports only the marker error, not the format error for its key. `docs new` writes this marker into each field and section it leaves for you to fill; replace it with content. No other text is treated as a placeholder, so words like TODO or TBD are fine. To mention the marker itself, put it in inline or fenced code.
+A record is invalid if it still contains the exact marker `{{docs:todo}}` anywhere outside code, including inside a frontmatter string value or list item (write it quoted there: `summary: "{{docs:todo}}"`). A list item equal to the marker reports only the marker error, not the format error for its key. `corestack-docs new` writes this marker into each field and section it leaves for you to fill; replace it with content. No other text is treated as a placeholder, so words like TODO or TBD are fine. To mention the marker itself, put it in inline or fenced code.
 
 ## 7. References and links
 
@@ -156,9 +156,9 @@ URL:
 
 Always allowed in body prose only: in-page anchors (`#section`) and `mailto:` links. Any other scheme is rejected.
 
-## 8. What `docs check` reports
+## 8. What `corestack-docs check` reports
 
-`docs check [--root DIR]` checks every record under `DIR` (default: the working directory) and prints one line per problem:
+`corestack-docs check [--root DIR]` checks every record under `DIR` (default: the working directory) and prints one line per problem:
 
 ```
 path:line: message

go.mod

@@ -3,6 +3,36 @@ module go.auvem.com/corestack
 go 1.27.1
 
 require (
+	github.com/jackc/pgx/v5 v5.11.0
+	github.com/lib/pq v1.10.9
+	github.com/mattn/go-sqlite3 v1.14.32
+	github.com/pressly/goose/v3 v3.29.0
+	github.com/stephenafamo/bob v0.50.0
+	github.com/stephenafamo/scan v0.9.0
+	github.com/urfave/cli/v3 v3.14.0
 	github.com/yuin/goldmark v1.8.6
 	go.yaml.in/yaml/v3 v3.0.5
+	modernc.org/sqlite v1.60.1
+)
+
+require (
+	github.com/aarondl/opt v0.0.0-20250607033636-982744e1bd65 // indirect
+	github.com/dustin/go-humanize v1.1.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.3 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/mfridman/interpolate v0.0.2 // indirect
+	github.com/ncruces/go-strftime v1.1.0 // indirect
+	github.com/qdm12/reprint v0.0.0-20200326205758-722754a53494 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/sethvargo/go-retry v0.5.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/sync v0.24.0 // indirect
+	golang.org/x/sys v0.49.0 // indirect
+	golang.org/x/text v0.43.0 // indirect
+	modernc.org/libc v1.78.0 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.12.1 // indirect
 )

go.sum

@@ -1,4 +1,216 @@
+dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
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lifecycle/cli/cli.go

@@ -0,0 +1,230 @@
+// Package cli runs caller-owned urfave/cli trees inside selected lifecycle modules.
+// It owns temporary signal subscriptions and exit classification, not process exit,
+// configuration, resource handles or unsupervised goroutines.
+package cli
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"os/signal"
+	"slices"
+	"syscall"
+
+	urfavecli "github.com/urfave/cli/v3"
+	"go.auvem.com/corestack/lifecycle"
+)
+
+// Run executes cliRoot with args including argv[0], returning 0 for success/help,
+// 2 for usage, and 1 for runtime failures. Lifecycle failures always take priority.
+// It prints a final diagnostic to cliRoot.ErrWriter and never exits the process.
+// Run reserves ExitErrHandler, OnUsageError and CommandNotFound throughout the
+// declared tree. Construct fresh trees for independent runs; do not mutate them
+// concurrently. Native generated-help parse and environment validation failures
+// may return 1 and print native diagnostics in addition to the final diagnostic.
+func Run(ctx context.Context, cliRoot *urfavecli.Command, args []string) (int, error) {
+	var err error
+	if ctx == nil || cliRoot == nil {
+		err = errors.New("cli: context and root command are required")
+	} else {
+		err = validateTree(cliRoot)
+	}
+	if err == nil {
+		var missing error
+		installHooks(cliRoot, &missing)
+		err = cliRoot.Run(ctx, args)
+		if missing != nil {
+			if err == nil {
+				err = missing
+			} else {
+				err = errors.Join(err, missing)
+			}
+		}
+	}
+	if err == nil {
+		return 0, nil
+	}
+	code := classify(err, 0)
+	err = expose(err)
+	if cliRoot != nil && cliRoot.ErrWriter != nil {
+		fmt.Fprintln(cliRoot.ErrWriter, err)
+	} else {
+		fmt.Fprintln(os.Stderr, err)
+	}
+	return code, err
+}
+
+func validateTree(cmd *urfavecli.Command) error {
+	if cmd == nil {
+		return errors.New("cli: nil command")
+	}
+	if cmd.ExitErrHandler != nil || cmd.OnUsageError != nil || cmd.CommandNotFound != nil {
+		return fmt.Errorf("cli: command %q sets a reserved error hook", cmd.Name)
+	}
+	for _, child := range cmd.Commands {
+		if err := validateTree(child); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func installHooks(cmd *urfavecli.Command, missing *error) {
+	cmd.ExitErrHandler = func(context.Context, *urfavecli.Command, error) {}
+	cmd.OnUsageError = func(_ context.Context, selected *urfavecli.Command, err error, _ bool) error {
+		_ = urfavecli.ShowSubcommandHelp(selected)
+		return &failure{err, 2}
+	}
+	cmd.CommandNotFound = func(_ context.Context, selected *urfavecli.Command, name string) {
+		*missing = errors.Join(*missing, &failure{fmt.Errorf("unknown command or help topic %q", name), 2})
+		_ = urfavecli.ShowSubcommandHelp(selected)
+	}
+	for _, child := range cmd.Commands {
+		installHooks(child, missing)
+	}
+}
+
+// Serve returns a native action running exactly modules, including their services,
+// in registration order with reverse cleanup. Bindings capture declarations without
+// starting work; resources and declarations must not be mutated concurrently.
+// Nil config.Signals subscribes to SIGINT/SIGTERM for the invocation, buffered for
+// two signals; an injected channel and its subscription remain caller-owned.
+// The private invocation App is unavailable for managed-worker admission.
+func Serve(config lifecycle.Config, modules []lifecycle.Module) urfavecli.ActionFunc {
+	return bind(config, modules, nil, false)
+}
+
+// Action returns a native one-off action using exactly modules with their Run
+// callbacks suppressed. All setups precede fn; completion triggers reverse cleanup.
+// fn receives lifecycle's signal-aware context and the selected native command.
+// Nil fn is a runtime configuration error. Signal and ownership rules match Serve;
+// hooks outside this action are outside the lifecycle shutdown guarantee.
+func Action(config lifecycle.Config, modules []lifecycle.Module, fn urfavecli.ActionFunc) urfavecli.ActionFunc {
+	return bind(config, modules, fn, true)
+}
+
+func bind(config lifecycle.Config, modules []lifecycle.Module, fn urfavecli.ActionFunc, oneOff bool) urfavecli.ActionFunc {
+	modules = slices.Clone(modules)
+	return func(ctx context.Context, cmd *urfavecli.Command) error {
+		err := execute(ctx, cmd, config, modules, fn, oneOff)
+		if err != nil {
+			return &failure{err, 1}
+		}
+		return nil
+	}
+}
+
+func execute(ctx context.Context, cmd *urfavecli.Command, config lifecycle.Config, modules []lifecycle.Module, fn urfavecli.ActionFunc, oneOff bool) error {
+	if oneOff && fn == nil {
+		return errors.New("cli: one-off function is required")
+	}
+	var signals chan os.Signal
+	if config.Signals == nil {
+		signals = make(chan os.Signal, 2)
+		config.Signals = signals
+	}
+	app, err := lifecycle.New(config)
+	if err != nil {
+		return err
+	}
+	names := make(map[string]bool, len(modules))
+	for _, module := range modules {
+		names[module.Name] = true
+		if oneOff {
+			module.Run = nil
+		}
+		if err := app.Register(module); err != nil {
+			return err
+		}
+	}
+	if oneOff {
+		name := "cli-action"
+		for names[name] {
+			name += "-"
+		}
+		noop := func(context.Context) error { return nil }
+		if err := app.Register(lifecycle.Module{Name: name, Setup: noop, Teardown: noop,
+			Run: func(ctx context.Context) error { return fn(ctx, cmd) }}); err != nil {
+			return err
+		}
+	}
+	if signals != nil {
+		signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
+		defer signal.Stop(signals)
+	}
+	return app.Run(ctx)
+}
+
+type failure struct {
+	error
+	code int
+}
+
+func (e *failure) Unwrap() error { return e.error }
+
+func children(err error) []error {
+	switch e := err.(type) {
+	case interface{ Unwrap() []error }:
+		return e.Unwrap()
+	case interface{ Unwrap() error }:
+		if child := e.Unwrap(); child != nil {
+			return []error{child}
+		}
+	case urfavecli.MultiError:
+		return e.Errors()
+	}
+	return nil
+}
+
+// invariant: runtime branches dominate usage; aggregate containers add no failure.
+func classify(err error, inherited int) int {
+	if e, ok := err.(*failure); ok {
+		if e.code == 1 {
+			return 1
+		}
+		inherited = e.code
+	} else if e, ok := err.(urfavecli.ExitCoder); ok && inherited == 0 {
+		inherited = 1
+		if e.ExitCode() == 2 {
+			inherited = 2
+		}
+	}
+	code := 0
+	for _, child := range children(err) {
+		if child == nil {
+			continue
+		}
+		next := classify(child, inherited)
+		if next == 1 {
+			return 1
+		}
+		code = next
+	}
+	if code != 0 {
+		return code
+	}
+	if inherited != 0 {
+		return inherited
+	}
+	return 1
+}
+
+// exposed retains native identity and formatting while making opaque MultiError
+// descendants reachable through standard errors.Is and errors.As traversal.
+type exposed struct {
+	error
+	causes []error
+}
+
+func (e *exposed) Unwrap() []error { return e.causes }
+
+func expose(err error) error {
+	causes := []error{err}
+	for _, child := range children(err) {
+		if child != nil {
+			causes = append(causes, expose(child))
+		}
+	}
+	return &exposed{err, causes}
+}

lifecycle/cli/cli_test.go

@@ -0,0 +1,428 @@
+package cli
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"reflect"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+
+	urfavecli "github.com/urfave/cli/v3"
+	"go.auvem.com/corestack/lifecycle"
+)
+
+func config() lifecycle.Config {
+	return lifecycle.Config{Logger: slog.New(slog.NewTextHandler(io.Discard, nil)), Signals: make(chan os.Signal, 2), ShutdownTimeout: time.Second}
+}
+
+func command(action urfavecli.ActionFunc) *urfavecli.Command {
+	return &urfavecli.Command{Name: "app", Writer: io.Discard, ErrWriter: io.Discard, Commands: []*urfavecli.Command{{Name: "inspect", Action: action, Flags: []urfavecli.Flag{&urfavecli.BoolFlag{Name: "verbose"}}}}}
+}
+
+func TestNativeLifecycleFlow(t *testing.T) {
+	for _, fail := range []bool{false, true} {
+		t.Run(fmt.Sprint(fail), func(t *testing.T) {
+			var order []string
+			boom := &os.PathError{Op: "inspect", Path: "db", Err: io.ErrUnexpectedEOF}
+			var selected []lifecycle.Module
+			for _, name := range []string{"cli-action", "cli-action-", "database"} {
+				selected = append(selected, lifecycle.Module{Name: name,
+					Setup:    func(context.Context) error { order = append(order, "setup "+name); return nil },
+					Run:      func(context.Context) error { t.Error("one-off service started"); return nil },
+					Teardown: func(context.Context) error { order = append(order, "close "+name); return nil }})
+			}
+			cliRoot := command(Action(config(), selected, func(_ context.Context, cmd *urfavecli.Command) error {
+				if !cmd.Bool("verbose") {
+					t.Error("native flag missing")
+				}
+				order = append(order, "inspect")
+				if fail {
+					return boom
+				}
+				return nil
+			}))
+			cliRoot.Commands = append(cliRoot.Commands, &urfavecli.Command{Name: "unused", Action: Serve(config(), []lifecycle.Module{{Name: "unused", Setup: func(context.Context) error { t.Error("unselected setup"); return nil }, Teardown: func(context.Context) error { return nil }}})})
+			code, err := Run(context.Background(), cliRoot, []string{"app", "inspect", "--verbose"})
+			if fail && (code != 1 || !errors.Is(err, boom)) || !fail && (code != 0 || err != nil) {
+				t.Fatalf("Run = %d, %v", code, err)
+			}
+			want := []string{"setup cli-action", "setup cli-action-", "setup database", "inspect", "close database", "close cli-action-", "close cli-action"}
+			if !reflect.DeepEqual(order, want) {
+				t.Fatalf("order %v", order)
+			}
+		})
+	}
+}
+
+func TestNativeUsageAndHelp(t *testing.T) {
+	for _, tc := range []struct {
+		args string
+		code int
+	}{
+		{"", 0}, {"--help", 0}, {"inspect --help", 0}, {"help inspect", 0}, {"group", 0}, {"group --help", 0},
+		{"missing", 2}, {"help missing", 2}, {"group missing", 2}, {"group help missing", 2},
+		{"--bad", 2}, {"inspect --bad", 2}, {"inspect --count", 2}, {"inspect --count nope", 2}, {"inspect", 2},
+		{"help --bad", 1}, {"h --bad", 1}, {"group help --bad", 1}, {"group h --bad", 1},
+	} {
+		t.Run(tc.args, func(t *testing.T) {
+			cliRoot := command(Action(config(), []lifecycle.Module{{Name: "db", Setup: func(context.Context) error { t.Error("setup during usage/help"); return nil }, Teardown: func(context.Context) error { return nil }}}, func(context.Context, *urfavecli.Command) error { t.Error("action during usage/help"); return nil }))
+			cliRoot.Commands[0].Flags = append(cliRoot.Commands[0].Flags, &urfavecli.IntFlag{Name: "count", Required: true})
+			cliRoot.Commands = append(cliRoot.Commands, &urfavecli.Command{Name: "group", Commands: []*urfavecli.Command{{Name: "child"}}})
+			var output, diagnostic bytes.Buffer
+			cliRoot.Writer = &output
+			cliRoot.ErrWriter = &diagnostic
+			code, err := Run(context.Background(), cliRoot, append([]string{"app"}, strings.Fields(tc.args)...))
+			if code != tc.code || (err != nil) != (tc.code != 0) {
+				t.Fatalf("Run=%d,%v; want %d", code, err, tc.code)
+			}
+			if output.Len() == 0 && tc.code != 1 {
+				t.Error("missing native help")
+			}
+			if (diagnostic.Len() > 0) != (tc.code != 0) {
+				t.Fatalf("diagnostic %q", diagnostic.String())
+			}
+		})
+	}
+}
+
+func TestNativeValidation(t *testing.T) {
+	for _, kind := range []string{"environment", "validator", "validator-exit", "flag-action", "required-argument", "argument-parse", "exclusive"} {
+		t.Run(kind, func(t *testing.T) {
+			cliRoot := command(func(context.Context, *urfavecli.Command) error {
+				t.Error("invalid invocation reached action")
+				return nil
+			})
+			cmd := cliRoot.Commands[0]
+			args := []string{"app", "inspect"}
+			want := 1
+			switch kind {
+			case "environment":
+				t.Setenv("CORESTACK_CLI_COUNT", "oops")
+				cmd.Flags = []urfavecli.Flag{&urfavecli.IntFlag{Name: "count", Sources: urfavecli.EnvVars("CORESTACK_CLI_COUNT")}}
+			case "validator", "validator-exit":
+				cmd.ArgValidator = func(context.Context, *urfavecli.Command) error {
+					if kind == "validator-exit" {
+						return urfavecli.Exit("invalid", 2)
+					}
+					return errors.New("invalid")
+				}
+				if kind == "validator-exit" {
+					want = 2
+				}
+			case "flag-action":
+				cmd.Flags = []urfavecli.Flag{&urfavecli.BoolFlag{Name: "bad", Action: func(context.Context, *urfavecli.Command, bool) error { return errors.New("invalid") }}}
+				args = append(args, "--bad")
+			case "required-argument":
+				cmd.Arguments = []urfavecli.Argument{&urfavecli.StringArg{Name: "target", Required: true}}
+				want = 2
+			case "argument-parse":
+				cmd.Arguments = []urfavecli.Argument{&urfavecli.IntArg{Name: "count"}}
+				args = append(args, "oops")
+				want = 2
+			case "exclusive":
+				cmd.MutuallyExclusiveFlags = []urfavecli.MutuallyExclusiveFlags{{Flags: [][]urfavecli.Flag{{&urfavecli.BoolFlag{Name: "a"}}, {&urfavecli.BoolFlag{Name: "b"}}}}}
+				args = append(args, "--a", "--b")
+				want = 2
+			}
+			code, err := Run(context.Background(), cliRoot, args)
+			if code != want || err == nil {
+				t.Fatalf("Run=%d,%v; want %d", code, err, want)
+			}
+		})
+	}
+}
+
+func TestFailureCategoriesAndCauses(t *testing.T) {
+	for _, kind := range []string{"native-exit2", "native-after", "native-exit0", "native-exit9", "action-exit2", "teardown", "setup", "action-after", "usage-after", "nested-after", "unknown-after"} {
+		t.Run(kind, func(t *testing.T) {
+			cause := &os.PathError{Op: "read", Path: "db", Err: io.ErrUnexpectedEOF}
+			after := errors.New("after")
+			parent := errors.New("parent after")
+			original := urfavecli.Exit(cause, 2)
+			cfg := config()
+			modules := []lifecycle.Module{{Name: "db", Setup: func(context.Context) error { return nil }, Teardown: func(context.Context) error { return nil }}}
+			action := func(context.Context, *urfavecli.Command) error { return original }
+			want := 1
+			args := []string{"app", "inspect"}
+			switch kind {
+			case "native-exit2":
+				want = 2
+			case "native-exit0":
+				original = urfavecli.Exit(cause, 0)
+			case "native-exit9":
+				original = urfavecli.Exit(cause, 9)
+			case "setup":
+				modules[0].Setup = func(context.Context) error { return cause }
+			case "teardown":
+				modules[0].Teardown = func(context.Context) error { return after }
+			}
+			cliRoot := command(action)
+			if !strings.HasPrefix(kind, "native-") {
+				cliRoot.Commands[0].Action = Action(cfg, modules, action)
+			}
+			if kind == "native-after" || kind == "action-after" || kind == "nested-after" || kind == "usage-after" {
+				cliRoot.Commands[0].After = func(context.Context, *urfavecli.Command) error { return after }
+			}
+			if kind == "nested-after" {
+				cliRoot.After = func(context.Context, *urfavecli.Command) error { return parent }
+			}
+			if kind == "usage-after" {
+				cliRoot.Commands[0].Flags = append(cliRoot.Commands[0].Flags, &urfavecli.StringFlag{Name: "needed", Required: true})
+			}
+			if kind == "unknown-after" {
+				args = []string{"app", "help", "missing"}
+				cliRoot.After = func(context.Context, *urfavecli.Command) error { return after }
+			}
+			code, err := Run(context.Background(), cliRoot, args)
+			if code != want || err == nil {
+				t.Fatalf("Run=%d,%v", code, err)
+			}
+			if kind != "usage-after" && kind != "unknown-after" {
+				var path *os.PathError
+				if !errors.Is(err, cause) || !errors.As(err, &path) || path != cause || !errors.Is(err, io.ErrUnexpectedEOF) {
+					t.Fatalf("cause lost: %v", err)
+				}
+				if kind != "setup" && !errors.Is(err, original) {
+					t.Fatalf("original identity lost: %v", err)
+				}
+			}
+			if kind == "teardown" || strings.HasSuffix(kind, "-after") {
+				if !errors.Is(err, after) {
+					t.Fatalf("After/cleanup lost: %v", err)
+				}
+			}
+			if kind == "nested-after" && !errors.Is(err, parent) {
+				t.Fatal("parent cause lost")
+			}
+			if kind == "native-after" || kind == "action-after" || kind == "nested-after" || kind == "usage-after" {
+				var multi urfavecli.MultiError
+				if !errors.As(err, &multi) || !errors.Is(err, multi) {
+					t.Fatalf("native aggregate lost: %v", err)
+				}
+				if err.Error() != multi.Error() {
+					t.Fatalf("duplicated formatting: %v", err)
+				}
+			}
+		})
+	}
+}
+
+func TestValidationBeforeSetup(t *testing.T) {
+	for _, kind := range []string{"nil-context", "nil-root", "nil-function", "nil-logger", "negative-timeout", "invalid-module", "duplicate-module", "nil-child", "exit-hook", "usage-hook", "not-found-hook"} {
+		t.Run(kind, func(t *testing.T) {
+			cfg := config()
+			noop := func(context.Context) error { return nil }
+			modules := []lifecycle.Module{{Name: "db", Setup: func(context.Context) error { t.Error("setup before validation"); return nil }, Teardown: noop}}
+			var ctx context.Context = context.Background()
+			fn := urfavecli.ActionFunc(func(context.Context, *urfavecli.Command) error { t.Error("action before validation"); return nil })
+			switch kind {
+			case "nil-context":
+				ctx = nil
+			case "nil-function":
+				fn = nil
+			case "nil-logger":
+				cfg.Logger = nil
+			case "negative-timeout":
+				cfg.ShutdownTimeout = -1
+			case "invalid-module":
+				modules = append(modules, lifecycle.Module{Name: "invalid"})
+			case "duplicate-module":
+				modules = append(modules, modules[0])
+			}
+			cliRoot := command(Action(cfg, modules, fn))
+			switch kind {
+			case "nil-root":
+				cliRoot = nil
+			case "nil-child":
+				cliRoot.Commands = append(cliRoot.Commands, nil)
+			case "exit-hook":
+				cliRoot.Commands[0].ExitErrHandler = func(context.Context, *urfavecli.Command, error) {}
+			case "usage-hook":
+				cliRoot.Commands[0].OnUsageError = func(context.Context, *urfavecli.Command, error, bool) error { return nil }
+			case "not-found-hook":
+				cliRoot.Commands[0].CommandNotFound = func(context.Context, *urfavecli.Command, string) {}
+			}
+			code, err := Run(ctx, cliRoot, []string{"app", "inspect"})
+			if code != 1 || err == nil {
+				t.Fatalf("Run=%d,%v", code, err)
+			}
+		})
+	}
+}
+func await[T any](t *testing.T, ch <-chan T) T {
+	t.Helper()
+	select {
+	case value := <-ch:
+		return value
+	case <-time.After(3 * time.Second):
+		t.Fatal("callback blocked")
+		var zero T
+		return zero
+	}
+}
+
+func TestSignalsAndParent(t *testing.T) {
+	for _, mode := range []string{"first", "second", "parent", "serve"} {
+		t.Run(mode, func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			cfg := config()
+			cfg.Signals = signals
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			ready := make(chan struct{})
+			canceled := make(chan struct{})
+			exited := make(chan struct{})
+			cleanup := make(chan struct{})
+			release := make(chan struct{})
+			defer func() { close(release); await(t, exited) }()
+			callback := func(ctx context.Context) error {
+				close(ready)
+				defer close(exited)
+				<-ctx.Done()
+				close(canceled)
+				if mode == "second" {
+					<-release
+				}
+				return ctx.Err()
+			}
+			modules := []lifecycle.Module{{Name: "db", Setup: func(context.Context) error { return nil }, Teardown: func(context.Context) error { close(cleanup); return nil }, Run: callback}}
+			action := Action(cfg, modules, func(ctx context.Context, _ *urfavecli.Command) error { return callback(ctx) })
+			if mode == "serve" {
+				action = Serve(cfg, modules)
+			}
+			done := make(chan struct {
+				code int
+				err  error
+			}, 1)
+			go func() {
+				code, err := Run(ctx, command(action), []string{"app", "inspect"})
+				done <- struct {
+					code int
+					err  error
+				}{code, err}
+			}()
+			await(t, ready)
+			if mode == "parent" {
+				cancel()
+			} else {
+				signals <- syscall.SIGINT
+			}
+			await(t, canceled)
+			await(t, cleanup)
+			if mode == "second" {
+				signals <- syscall.SIGTERM
+			}
+			result := await(t, done)
+			want := 0
+			if mode == "second" || mode == "parent" {
+				want = 1
+			}
+			if result.code != want || (result.err != nil) != (want != 0) {
+				t.Fatalf("Run=%d,%v", result.code, result.err)
+			}
+			if want == 1 && !errors.Is(result.err, context.Canceled) {
+				t.Fatalf("cancellation lost: %v", result.err)
+			}
+			// The adapter must leave the injected channel open and reusable.
+			signals <- syscall.SIGTERM
+		})
+	}
+}
+
+func TestSharedShutdownDeadline(t *testing.T) {
+	cfg := config()
+	cfg.ShutdownTimeout = 100 * time.Millisecond
+	ready := make(chan struct{})
+	shutdown := make(chan time.Time, 1)
+	exited := make(chan struct{})
+	release := make(chan struct{})
+	defer func() { close(release); await(t, exited) }()
+	var first time.Time
+	noop := func(context.Context) error { return nil }
+	modules := []lifecycle.Module{
+		{Name: "blocked", Setup: noop, Teardown: func(ctx context.Context) error {
+			defer close(exited)
+			deadline, _ := ctx.Deadline()
+			shutdown <- deadline
+			<-release
+			return nil
+		}},
+		{Name: "first", Setup: noop, Teardown: func(ctx context.Context) error {
+			first, _ = ctx.Deadline()
+			time.Sleep(20 * time.Millisecond)
+			return nil
+		}},
+	}
+	done := make(chan error, 1)
+	go func() {
+		_, err := Run(context.Background(), command(Action(cfg, modules, func(context.Context, *urfavecli.Command) error { close(ready); return nil })), []string{"app", "inspect"})
+		done <- err
+	}()
+	await(t, ready)
+	deadline := await(t, shutdown)
+	if !first.Equal(deadline) {
+		t.Fatal("shutdown deadline reset between hooks")
+	}
+	if err := await(t, done); !errors.Is(err, context.DeadlineExceeded) {
+		t.Fatalf("deadline lost: %v", err)
+	}
+}
+
+func TestEmptySelectionsAndOwnedSignals(t *testing.T) {
+	for _, oneOff := range []bool{false, true} {
+		cfg := config()
+		cfg.Signals = nil
+		action := Serve(cfg, nil)
+		if oneOff {
+			action = Action(cfg, nil, func(context.Context, *urfavecli.Command) error { return nil })
+		}
+		if code, err := Run(context.Background(), command(action), []string{"app", "inspect"}); code != 0 || err != nil {
+			t.Fatalf("Run=%d,%v", code, err)
+		}
+	}
+	cfg := config()
+	signals := make(chan os.Signal)
+	close(signals)
+	cfg.Signals = signals
+	if code, err := Run(context.Background(), command(Serve(cfg, nil)), []string{"app", "inspect"}); code != 0 || err != nil {
+		t.Fatalf("closed signals: %d,%v", code, err)
+	}
+}
+func TestPartialSetupAndMixedCleanup(t *testing.T) {
+	for _, setupFailure := range []bool{false, true} {
+		t.Run(fmt.Sprint(setupFailure), func(t *testing.T) {
+			initiating := urfavecli.Exit(io.ErrUnexpectedEOF, 2)
+			cleanup := errors.New("cleanup")
+			var order []string
+			modules := []lifecycle.Module{
+				{Name: "first", Setup: func(context.Context) error { order = append(order, "first setup"); return nil }, Teardown: func(context.Context) error { order = append(order, "first cleanup"); return cleanup }},
+				{Name: "second", Setup: func(context.Context) error {
+					order = append(order, "second setup")
+					if setupFailure {
+						return initiating
+					}
+					return nil
+				}, Teardown: func(context.Context) error { order = append(order, "second cleanup"); return nil }},
+			}
+			cliRoot := command(Action(config(), modules, func(context.Context, *urfavecli.Command) error { order = append(order, "action"); return initiating }))
+			code, err := Run(context.Background(), cliRoot, []string{"app", "inspect"})
+			if code != 1 || !errors.Is(err, initiating) || !errors.Is(err, cleanup) || !errors.Is(err, io.ErrUnexpectedEOF) {
+				t.Fatalf("Run=%d,%v", code, err)
+			}
+			want := []string{"first setup", "second setup", "first cleanup"}
+			if !setupFailure {
+				want = []string{"first setup", "second setup", "action", "second cleanup", "first cleanup"}
+			}
+			if !reflect.DeepEqual(order, want) {
+				t.Fatalf("order %v", order)
+			}
+		})
+	}
+}

lifecycle/cli/example_test.go

@@ -0,0 +1,51 @@
+package cli_test
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+
+	urfavecli "github.com/urfave/cli/v3"
+	"go.auvem.com/corestack/lifecycle"
+	"go.auvem.com/corestack/lifecycle/cli"
+)
+
+func Example() {
+	cfg := lifecycle.Config{Logger: slog.New(slog.NewTextHandler(io.Discard, nil))}
+	for _, args := range [][]string{{"app", "serve"}, {"app", "inspect", "--verbose"}} {
+		var database string
+		db := lifecycle.Module{Name: "database",
+			Setup:    func(context.Context) error { database = "connected"; fmt.Println("open database"); return nil },
+			Teardown: func(context.Context) error { fmt.Println("close database"); database = ""; return nil },
+		}
+		server := lifecycle.Module{Name: "server",
+			Setup: func(context.Context) error { fmt.Println("open server"); return nil },
+			// A real server blocks until cancellation; this finite service keeps the example executable.
+			Run:      func(context.Context) error { fmt.Println("serve:", database); return nil },
+			Teardown: func(context.Context) error { fmt.Println("close server"); return nil },
+		}
+		cliRoot := &urfavecli.Command{Name: "app", Commands: []*urfavecli.Command{
+			{Name: "serve", Action: cli.Serve(cfg, []lifecycle.Module{db, server})},
+			{Name: "inspect", Flags: []urfavecli.Flag{&urfavecli.BoolFlag{Name: "verbose"}},
+				Action: cli.Action(cfg, []lifecycle.Module{db}, func(_ context.Context, cmd *urfavecli.Command) error {
+					fmt.Println("inspect:", database, "verbose:", cmd.Bool("verbose"))
+					return nil
+				})},
+		}}
+		code, err := cli.Run(context.Background(), cliRoot, args)
+		fmt.Println("exit:", code, err)
+		// main may call os.Exit(code) here, after adapter cleanup.
+	}
+	// Output:
+	// open database
+	// open server
+	// serve: connected
+	// close server
+	// close database
+	// exit: 0 <nil>
+	// open database
+	// inspect: connected verbose: true
+	// close database
+	// exit: 0 <nil>
+}

lifecycle/example_test.go

@@ -0,0 +1,102 @@
+package lifecycle_test
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"syscall"
+	"testing"
+	"time"
+
+	"go.auvem.com/corestack/lifecycle"
+)
+
+func TestRealFlow(t *testing.T) {
+	for _, failure := range []bool{false, true} {
+		t.Run(fmt.Sprint(failure), func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			app, err := lifecycle.New(lifecycle.Config{Logger: slog.New(slog.NewTextHandler(io.Discard, nil)), Signals: signals, ShutdownTimeout: time.Second})
+			if err != nil {
+				t.Fatal(err)
+			}
+			ready := make(chan struct{}, 3)
+			release := make(chan struct{})
+			t.Cleanup(func() {
+				select {
+				case <-release:
+				default:
+					close(release)
+				}
+			})
+			failed := errors.New("service failed")
+			for _, name := range []string{"daemon", "muxer"} {
+				err = app.Register(lifecycle.Module{Name: name, Setup: func(ctx context.Context) error {
+					if name == "daemon" {
+						return app.Go(ctx, "queue", func(ctx context.Context) error { ready <- struct{}{}; <-ctx.Done(); <-release; return ctx.Err() })
+					}
+					return nil
+				}, Run: func(ctx context.Context) error {
+					ready <- struct{}{}
+					if name == "muxer" && failure {
+						<-release
+						return failed
+					}
+					<-ctx.Done()
+					return ctx.Err()
+				}, Teardown: func(context.Context) error { return nil }})
+				if err != nil {
+					t.Fatal(err)
+				}
+			}
+			done := make(chan error, 1)
+			go func() { done <- app.Run(context.Background()) }()
+			for range 3 {
+				select {
+				case <-ready:
+				case <-time.After(3 * time.Second):
+					t.Fatal("services did not start")
+				}
+			}
+			if !failure {
+				signals <- syscall.SIGTERM
+			}
+			close(release)
+			select {
+			case err = <-done:
+				if failure && !errors.Is(err, failed) || !failure && err != nil {
+					t.Fatalf("Run: %v", err)
+				}
+			case <-time.After(2 * time.Second):
+				t.Fatal("Run blocked")
+			}
+		})
+	}
+}
+
+func Example() {
+	signals := make(chan os.Signal, 2)
+	app, err := lifecycle.New(lifecycle.Config{Logger: slog.New(slog.NewTextHandler(io.Discard, nil)), Signals: signals})
+	if err != nil {
+		panic(err)
+	}
+	ready := make(chan struct{}, 2)
+	for _, name := range []string{"daemon", "muxer"} {
+		err := app.Register(lifecycle.Module{
+			Name: name,
+			Setup: func(ctx context.Context) error {
+				return app.Go(ctx, name+" worker", func(ctx context.Context) error { <-ctx.Done(); return ctx.Err() })
+			},
+			Run:      func(ctx context.Context) error { ready <- struct{}{}; <-ctx.Done(); return ctx.Err() },
+			Teardown: func(context.Context) error { return nil },
+		})
+		if err != nil {
+			panic(err)
+		}
+	}
+	go func() { <-ready; <-ready; signals <- syscall.SIGTERM }()
+	fmt.Println(app.Run(context.Background()))
+	// Output: <nil>
+}

lifecycle/lifecycle.go

@@ -0,0 +1,349 @@
+// Package lifecycle supervises ordered module setup, concurrent services and
+// explicitly admitted workers within one shutdown budget. It owns cancellation
+// and reverse teardown, not signal subscriptions, process exit or raw goroutines.
+// Callbacks and the injected logger must cooperate: abandonment bounds Run's
+// return, but cannot kill callbacks or reclaim their resources.
+package lifecycle
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"os"
+	"sync"
+	"time"
+)
+
+// Module describes one resource owner. Setup acquires resources; Teardown releases
+// them after successful setup. A failing Setup owns its partial cleanup. Optional
+// Run starts only after all setups succeed. Callbacks must honor cancellation.
+type Module struct {
+	// Name identifies the module in errors.
+	Name string
+	// Setup acquires resources before any service starts.
+	Setup func(context.Context) error
+	// Teardown releases resources after successful Setup.
+	Teardown func(context.Context) error
+	// Run optionally serves until completion or cancellation.
+	Run func(context.Context) error
+}
+
+// Config supplies application policy. Logger is required and must not block.
+// Zero ShutdownTimeout selects 30 seconds; negative values are invalid.
+// The caller owns Signals, its subscription and cleanup, filtering to SIGINT and
+// SIGTERM and buffering at least two signals. Nil or closed disables reception.
+type Config struct {
+	// Logger receives lifecycle diagnostics and must not block.
+	Logger *slog.Logger
+	// Signals is a caller-owned, filtered signal source.
+	Signals <-chan os.Signal
+	// ShutdownTimeout bounds all shutdown work together.
+	ShutdownTimeout time.Duration
+}
+
+// App is a single-use coordinator constructed by New. Do not copy it. Register
+// modules before Run; Go may be called concurrently during setup and running.
+// App stores no context. After abandonment, callers own process exit and must not
+// reuse resources whose callbacks have not returned.
+type App struct {
+	config        Config
+	mu            sync.Mutex
+	modules       []Module
+	used          bool
+	accepting     bool
+	stopping      bool
+	active        int
+	cancel        context.CancelCauseFunc
+	shutdownCause error
+	stoppedAt     time.Time
+	errs          []error
+	wake          chan struct{}
+}
+
+// New validates and captures config without subscribing to signals or starting work.
+func New(config Config) (*App, error) {
+	if config.Logger == nil {
+		return nil, errors.New("lifecycle: logger is required")
+	}
+	if config.ShutdownTimeout < 0 {
+		return nil, errors.New("lifecycle: negative shutdown timeout")
+	}
+	if config.ShutdownTimeout == 0 {
+		config.ShutdownTimeout = 30 * time.Second
+	}
+	return &App{config: config, wake: make(chan struct{}, 1)}, nil
+}
+
+// Register captures a uniquely named module with required setup and teardown.
+// Registration closes permanently when Run begins, including a failed run.
+func (a *App) Register(module Module) error {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if a.used {
+		return errors.New("lifecycle: registration is closed")
+	}
+	if module.Name == "" || module.Setup == nil || module.Teardown == nil {
+		return errors.New("lifecycle: module needs name, setup and teardown")
+	}
+	for _, m := range a.modules {
+		if m.Name == module.Name {
+			return fmt.Errorf("lifecycle: duplicate module %q", module.Name)
+		}
+	}
+	a.modules = append(a.modules, module)
+	return nil
+}
+
+// Go immediately launches and tracks fn, or returns an admission error without
+// launching it. ctx must be a callback's lifecycle context or a descendant;
+// ancestry is a caller precondition and cannot generally be checked. Detached
+// contexts forfeit graceful cancellation. Names are diagnostic and may repeat.
+// Callers must handle rejection; raw goroutines are outside App's guarantee.
+func (a *App) Go(ctx context.Context, name string, fn func(context.Context) error) error {
+	if ctx == nil || name == "" || fn == nil {
+		return errors.New("lifecycle: worker needs context, name and function")
+	}
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if !a.accepting {
+		return errors.New("lifecycle: worker admission is closed")
+	}
+	a.launchLocked(ctx, "worker", name, fn)
+	return nil
+}
+
+func (a *App) notifyLocked() {
+	select {
+	case a.wake <- struct{}{}:
+	default:
+	}
+}
+
+func (a *App) stopLocked() {
+	if !a.stopping {
+		// invariant: closure and admission share the lock, so every accepted worker is counted.
+		a.accepting = false
+		a.stopping = true
+		a.stoppedAt = time.Now()
+		a.cancel(a.shutdownCause)
+	}
+	a.notifyLocked()
+}
+
+// cancellationOnly recognizes expected cancellation without rebuilding error trees.
+func cancellationOnly(err, cancellation error) bool {
+	if err == nil {
+		return false
+	}
+	if err == cancellation {
+		return true
+	}
+	if many, ok := err.(interface{ Unwrap() []error }); ok {
+		children := many.Unwrap()
+		for _, child := range children {
+			if !cancellationOnly(child, cancellation) {
+				return false
+			}
+		}
+		return len(children) > 0
+	}
+	if one, ok := err.(interface{ Unwrap() error }); ok {
+		return cancellationOnly(one.Unwrap(), cancellation)
+	}
+	return false
+}
+
+func (a *App) recordLocked(ctx context.Context, phase, name string, err error) {
+	if a.stopping && context.Cause(ctx) == a.shutdownCause && cancellationOnly(err, ctx.Err()) {
+		err = nil
+	}
+	if err != nil {
+		a.errs = append(a.errs, fmt.Errorf("%s %q: %w", phase, name, err))
+		a.stopLocked()
+	}
+}
+
+func (a *App) launchLocked(ctx context.Context, phase, name string, fn func(context.Context) error) {
+	a.active++
+	go func() {
+		err := fn(ctx)
+		a.mu.Lock()
+		defer a.mu.Unlock()
+		a.recordLocked(ctx, phase, name, err)
+		a.active--
+		a.notifyLocked()
+	}()
+}
+
+// Run sets up modules in registration order, then runs services concurrently.
+// Every service and admitted worker must finish for normal completion. The first
+// failure, parent cancellation or signal cancels their shared context and closes
+// admission before reverse teardown. A fresh context retains parent values and
+// gives teardown and callback completion one deadline from the shutdown trigger.
+// In-flight setup is awaited within that budget before rollback; abandoned setup
+// is never torn down later. Deadline or second signal abandons outstanding work.
+// Observed failures are joined; expected callback cancellation during established
+// shutdown is omitted only for cancellation-only error trees. Mixed errors remain
+// intact to preserve wrapper types, identity and matching, so may still match
+// cancellation. Initiating failures and every teardown error remain.
+// Cancellation is omitted only when context.Cause proves App caused it; parent
+// propagation and independently canceled descendants are retained conservatively.
+// Run never recovers panics, closes Signals or exits the process.
+func (a *App) Run(parent context.Context) error {
+	if parent == nil {
+		return errors.New("lifecycle: nil run context")
+	}
+	a.mu.Lock()
+	if a.used {
+		a.mu.Unlock()
+		return errors.New("lifecycle: app already run")
+	}
+	ctx, cancel := context.WithCancelCause(parent)
+	a.cancel = cancel
+	a.shutdownCause = errors.New("lifecycle shutdown")
+	a.used = true
+	a.accepting = true
+	modules := a.modules
+	a.mu.Unlock()
+	defer cancel(nil)
+	signals := a.config.Signals
+	signalCount := 0
+	var shutdown context.Context
+	var shutdownCancel context.CancelFunc
+	var setupDone <-chan error
+	completed := 0
+	var teardownDone <-chan error
+	teardownIndex := -1
+	startup := true
+	parentDone := parent.Done()
+	receiveSignal := func(sig os.Signal) error {
+		signalCount++
+		if signalCount == 2 {
+			if shutdownCancel != nil {
+				shutdownCancel()
+			}
+			return fmt.Errorf("second signal %v: %w", sig, context.Canceled)
+		}
+		a.mu.Lock()
+		a.stopLocked()
+		a.mu.Unlock()
+		return nil
+	}
+
+	for {
+		// invariant: queued abandonment is observed before starting another hook.
+		select {
+		case sig, ok := <-signals:
+			if !ok {
+				signals = nil
+			} else if err := receiveSignal(sig); err != nil {
+				return a.result(parent, err)
+			}
+			continue
+		default:
+		}
+
+		a.mu.Lock()
+		if !a.stopping && parent.Err() != nil {
+			a.stopLocked()
+			parentDone = nil
+		}
+		if !a.stopping && startup && setupDone == nil {
+			if completed < len(modules) {
+				m := modules[completed]
+				// invariant: buffered hook results cannot strand a sender after abandonment.
+				result := make(chan error, 1)
+				setupDone = result
+				go func() {
+					err := m.Setup(ctx)
+					a.mu.Lock()
+					a.recordLocked(ctx, "setup", m.Name, err)
+					a.mu.Unlock()
+					result <- err
+				}()
+			} else {
+				startup = false
+				for _, m := range modules {
+					if m.Run != nil {
+						a.launchLocked(ctx, "run", m.Name, m.Run)
+					}
+				}
+			}
+		}
+		if !a.stopping && !startup && a.active == 0 {
+			a.stopLocked()
+		}
+		if a.stopping && shutdown == nil {
+			created, release := context.WithDeadline(context.WithoutCancel(parent), a.stoppedAt.Add(a.config.ShutdownTimeout))
+			shutdown, shutdownCancel = created, release
+			defer release()
+			teardownIndex = completed - 1
+			a.config.Logger.Debug("lifecycle shutdown started")
+		}
+		stopping := a.stopping
+		active := a.active
+		a.mu.Unlock()
+
+		if stopping {
+			if err := shutdown.Err(); err != nil {
+				return a.result(parent, err)
+			}
+			if setupDone == nil && teardownDone == nil {
+				if teardownIndex >= 0 {
+					m := modules[teardownIndex]
+					result := make(chan error, 1)
+					teardownDone = result
+					go func() { result <- m.Teardown(shutdown) }()
+				} else if active == 0 {
+					return a.result(parent, nil)
+				}
+			}
+		}
+		var deadline <-chan struct{}
+		if shutdown != nil {
+			deadline = shutdown.Done()
+		}
+		select {
+		case err := <-setupDone:
+			setupDone = nil
+			if err == nil {
+				completed++
+				if stopping {
+					teardownIndex = completed - 1
+				}
+			}
+		case err := <-teardownDone:
+			teardownDone = nil
+			if err != nil {
+				a.mu.Lock()
+				a.errs = append(a.errs, fmt.Errorf("teardown %q: %w", modules[teardownIndex].Name, err))
+				a.mu.Unlock()
+			}
+			teardownIndex--
+		case <-a.wake:
+		case <-parentDone:
+			a.mu.Lock()
+			a.stopLocked()
+			a.mu.Unlock()
+			parentDone = nil
+		case sig, ok := <-signals:
+			if !ok {
+				signals = nil
+				continue
+			}
+			if err := receiveSignal(sig); err != nil {
+				return a.result(parent, err)
+			}
+		case <-deadline:
+			return a.result(parent, context.DeadlineExceeded)
+		}
+	}
+}
+
+func (a *App) result(parent context.Context, extra error) error {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	// invariant: every completion and abandonment retains parent cancellation exactly once.
+	return errors.Join(append(a.errs, parent.Err(), extra)...)
+}

lifecycle/lifecycle_test.go

@@ -0,0 +1,676 @@
+package lifecycle
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"reflect"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"testing"
+	"time"
+)
+
+func newApp(t *testing.T, signals <-chan os.Signal, timeout time.Duration) *App {
+	t.Helper()
+	a, err := New(Config{Logger: slog.New(slog.NewTextHandler(io.Discard, nil)), Signals: signals, ShutdownTimeout: timeout})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return a
+}
+func add(t *testing.T, a *App, m Module) {
+	t.Helper()
+	if m.Setup == nil {
+		m.Setup = func(context.Context) error { return nil }
+	}
+	if m.Teardown == nil {
+		m.Teardown = func(context.Context) error { return nil }
+	}
+	if err := a.Register(m); err != nil {
+		t.Fatal(err)
+	}
+}
+func run(a *App, ctx context.Context) <-chan error {
+	done := make(chan error, 1)
+	go func() { done <- a.Run(ctx) }()
+	return done
+}
+func receive(t *testing.T, done <-chan error) error {
+	t.Helper()
+	select {
+	case err := <-done:
+		return err
+	case <-time.After(3 * time.Second):
+		t.Fatal("Run blocked")
+		return nil
+	}
+}
+func wait(t *testing.T, ch <-chan struct{}) {
+	t.Helper()
+	select {
+	case <-ch:
+	case <-time.After(3 * time.Second):
+		t.Fatal("callback blocked")
+	}
+}
+
+func TestValidation(t *testing.T) {
+	if _, err := New(Config{}); err == nil {
+		t.Fatal("nil logger accepted")
+	}
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	if _, err := New(Config{Logger: logger, ShutdownTimeout: -1}); err == nil {
+		t.Fatal("negative timeout accepted")
+	}
+	a := newApp(t, nil, 0)
+	if a.config.ShutdownTimeout != 30*time.Second {
+		t.Fatal("wrong default")
+	}
+	if a.Register(Module{Name: "bad"}) == nil {
+		t.Fatal("invalid module accepted")
+	}
+	add(t, a, Module{Name: "one"})
+	if a.Register(a.modules[0]) == nil {
+		t.Fatal("duplicate accepted")
+	}
+	if a.Go(context.Background(), "early", func(context.Context) error { return nil }) == nil {
+		t.Fatal("early worker accepted")
+	}
+	if a.Run(nil) == nil {
+		t.Fatal("nil context accepted")
+	}
+	if err := a.Run(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if a.Run(context.Background()) == nil || a.Register(Module{}) == nil {
+		t.Fatal("reuse accepted")
+	}
+	for _, tc := range []struct {
+		ctx  context.Context
+		name string
+		fn   func(context.Context) error
+	}{{nil, "x", func(context.Context) error { return nil }}, {context.Background(), "", func(context.Context) error { return nil }}, {context.Background(), "x", nil}} {
+		if a.Go(tc.ctx, tc.name, tc.fn) == nil {
+			t.Fatal("invalid worker accepted")
+		}
+	}
+}
+
+func TestOrderRollbackAndJoinedErrors(t *testing.T) {
+	for _, fail := range []bool{false, true} {
+		t.Run(map[bool]string{false: "normal", true: "rollback"}[fail], func(t *testing.T) {
+			a := newApp(t, nil, 0)
+			var order []string
+			setupErr := errors.New("setup failed")
+			first := errors.New("cleanup first")
+			second := errors.New("cleanup second")
+			for _, name := range []string{"one", "two", "three"} {
+				add(t, a, Module{Name: name, Setup: func(context.Context) error {
+					order = append(order, "setup "+name)
+					if fail && name == "three" {
+						return setupErr
+					}
+					return nil
+				}, Teardown: func(context.Context) error {
+					order = append(order, "stop "+name)
+					if name == "one" {
+						return first
+					}
+					if name == "two" {
+						return second
+					}
+					return nil
+				}})
+			}
+			err := a.Run(context.Background())
+			want := []string{"setup one", "setup two", "setup three"}
+			if !fail {
+				want = append(want, "stop three")
+			}
+			want = append(want, "stop two", "stop one")
+			if !reflect.DeepEqual(order, want) {
+				t.Fatalf("order %v", order)
+			}
+			if !errors.Is(err, first) || !errors.Is(err, second) || errors.Is(err, setupErr) != fail {
+				t.Fatalf("errors %v", err)
+			}
+		})
+	}
+}
+
+func TestAllWorkCompletion(t *testing.T) {
+	for _, kind := range []string{"service", "worker"} {
+		t.Run(kind, func(t *testing.T) {
+			a := newApp(t, nil, 0)
+			ready := make(chan struct{})
+			release := make(chan struct{})
+			var once sync.Once
+			defer once.Do(func() { close(release) })
+			fn := func(context.Context) error { close(ready); <-release; return nil }
+			m := Module{Name: "long"}
+			if kind == "service" {
+				m.Run = fn
+			} else {
+				m.Setup = func(ctx context.Context) error { return a.Go(ctx, "long", fn) }
+			}
+			add(t, a, m)
+			add(t, a, Module{Name: "short", Run: func(context.Context) error { return nil }})
+			done := run(a, context.Background())
+			wait(t, ready)
+			select {
+			case err := <-done:
+				t.Fatalf("early completion: %v", err)
+			case <-time.After(10 * time.Millisecond):
+			}
+			once.Do(func() { close(release) })
+			if err := receive(t, done); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}
+
+func TestWorkerFailureAndTeardownUnblocks(t *testing.T) {
+	a := newApp(t, nil, time.Second)
+	released := make(chan struct{})
+	ready := make(chan struct{})
+	failure := errors.New("worker failed")
+	add(t, a, Module{Name: "resource", Setup: func(ctx context.Context) error {
+		return a.Go(ctx, "waiting", func(ctx context.Context) error { close(ready); <-ctx.Done(); <-released; return ctx.Err() })
+	}, Teardown: func(ctx context.Context) error {
+		if ctx.Err() != nil {
+			t.Errorf("teardown canceled early: %v", ctx.Err())
+		}
+		close(released)
+		return nil
+	}, Run: func(context.Context) error { <-ready; return failure }})
+	err := a.Run(context.Background())
+	if !errors.Is(err, failure) || errors.Is(err, context.Canceled) {
+		t.Fatalf("errors %v", err)
+	}
+	b := newApp(t, nil, 0)
+	add(t, b, Module{Name: "worker", Setup: func(ctx context.Context) error {
+		return b.Go(ctx, "failing", func(context.Context) error { return failure })
+	}, Run: func(ctx context.Context) error { <-ctx.Done(); return ctx.Err() }})
+	if err = b.Run(context.Background()); !errors.Is(err, failure) {
+		t.Fatalf("worker error %v", err)
+	}
+}
+
+func TestSignalDuringSetup(t *testing.T) {
+	aSignals := make(chan os.Signal, 2)
+	a := newApp(t, aSignals, time.Second)
+	entered := make(chan struct{})
+	rolled := false
+	partialCleaned := false
+	add(t, a, Module{Name: "ready", Teardown: func(context.Context) error { rolled = true; return nil }})
+	add(t, a, Module{Name: "partial", Setup: func(ctx context.Context) error {
+		close(entered)
+		<-ctx.Done()
+		partialCleaned = true
+		return errors.Join(ctx.Err(), nil)
+	}, Teardown: func(context.Context) error { t.Error("failed setup torn down"); return nil }})
+	add(t, a, Module{Name: "never", Setup: func(context.Context) error { t.Error("late setup started"); return nil }})
+	done := run(a, context.Background())
+	wait(t, entered)
+	aSignals <- syscall.SIGINT
+	if err := receive(t, done); err != nil {
+		t.Fatal(err)
+	}
+	if !rolled || !partialCleaned {
+		t.Fatal("cleanup missing")
+	}
+	b := newApp(t, nil, 0)
+	add(t, b, Module{Name: "initiator", Setup: func(context.Context) error { return context.Canceled }})
+	if err := b.Run(context.Background()); !errors.Is(err, context.Canceled) {
+		t.Fatalf("initiator lost: %v", err)
+	}
+}
+
+func TestMixedErrorsAndParentValues(t *testing.T) {
+	type key struct{}
+	parent, cancel := context.WithCancel(context.WithValue(context.Background(), key{}, "value"))
+	defer cancel()
+	a := newApp(t, nil, time.Second)
+	ready := make(chan struct{})
+	independent := errors.New("independent")
+	teardownErr := errors.New("teardown")
+	add(t, a, Module{Name: "mixed", Run: func(ctx context.Context) error {
+		close(ready)
+		<-ctx.Done()
+		return errors.Join(ctx.Err(), independent)
+	}, Teardown: func(ctx context.Context) error {
+		if ctx.Value(key{}) != "value" || ctx.Err() != nil {
+			t.Error("shutdown context lost values or inherited cancellation")
+		}
+		return errors.Join(teardownErr, context.Canceled)
+	}})
+	done := run(a, parent)
+	wait(t, ready)
+	cancel()
+	err := receive(t, done)
+	for _, want := range []error{context.Canceled, independent, teardownErr} {
+		if !errors.Is(err, want) {
+			t.Fatalf("missing %v: %v", want, err)
+		}
+	}
+	if !strings.Contains(err.Error(), "mixed") {
+		t.Fatal("missing diagnostic name")
+	}
+}
+
+func TestBoundedHooksAndWorkers(t *testing.T) {
+	for _, kind := range []string{"setup", "teardown", "worker"} {
+		t.Run(kind, func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			a := newApp(t, signals, 30*time.Millisecond)
+			entered := make(chan struct{})
+			release := make(chan struct{})
+			exited := make(chan struct{})
+			defer func() { close(release); wait(t, exited) }()
+			blocked := func(context.Context) error { close(entered); <-release; close(exited); return nil }
+			var torn atomic.Int32
+			m := Module{Name: "blocked", Teardown: func(context.Context) error { torn.Add(1); return nil }}
+			switch kind {
+			case "setup":
+				m.Setup = blocked
+			case "teardown":
+				m.Teardown = blocked
+			case "worker":
+				m.Setup = func(ctx context.Context) error { return a.Go(ctx, "blocked", blocked) }
+			}
+			add(t, a, m)
+			done := run(a, context.Background())
+			wait(t, entered)
+			start := time.Now()
+			signals <- syscall.SIGTERM
+			err := receive(t, done)
+			if !errors.Is(err, context.DeadlineExceeded) {
+				t.Fatalf("deadline missing: %v", err)
+			}
+			if time.Since(start) > time.Second {
+				t.Fatal("shutdown exceeded bound")
+			}
+			if kind == "setup" && torn.Load() != 0 {
+				t.Fatal("abandoned setup torn down")
+			}
+		})
+	}
+}
+
+func TestSecondSignalAndClosedSource(t *testing.T) {
+	for _, trigger := range []string{"signal", "failure"} {
+		t.Run(trigger, func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			a := newApp(t, signals, time.Second)
+			entered := make(chan struct{})
+			release := make(chan struct{})
+			exited := make(chan struct{})
+			defer func() { close(release); wait(t, exited) }()
+			failure := errors.New("failed")
+			ready := make(chan struct{})
+			add(t, a, Module{Name: "blocked", Run: func(ctx context.Context) error {
+				close(ready)
+				if trigger == "failure" {
+					return failure
+				}
+				<-ctx.Done()
+				return ctx.Err()
+			}, Teardown: func(context.Context) error { close(entered); <-release; close(exited); return nil }})
+			done := run(a, context.Background())
+			wait(t, ready)
+			if trigger == "signal" {
+				signals <- syscall.SIGINT
+			}
+			wait(t, entered)
+			if trigger == "failure" {
+				signals <- syscall.SIGINT
+			}
+			signals <- syscall.SIGTERM
+			err := receive(t, done)
+			if !errors.Is(err, context.Canceled) || errors.Is(err, failure) != (trigger == "failure") {
+				t.Fatalf("abandonment %v", err)
+			}
+		})
+	}
+	signals := make(chan os.Signal)
+	close(signals)
+	a := newApp(t, signals, 0)
+	if err := a.Run(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestAdmissionRace(t *testing.T) {
+	for range 50 {
+		a := newApp(t, nil, time.Second)
+		parent, cancel := context.WithCancel(context.Background())
+		ready := make(chan context.Context, 1)
+		add(t, a, Module{Name: "service", Run: func(ctx context.Context) error { ready <- ctx; <-ctx.Done(); return ctx.Err() }})
+		done := run(a, parent)
+		ctx := <-ready
+		var accepted, finished atomic.Int32
+		var callers sync.WaitGroup
+		for range 20 {
+			callers.Go(func() {
+				if err := a.Go(ctx, "racer", func(context.Context) error { finished.Add(1); return nil }); err == nil {
+					accepted.Add(1)
+				}
+			})
+		}
+		cancel()
+		callers.Wait()
+		err := receive(t, done)
+		if !errors.Is(err, context.Canceled) {
+			t.Fatalf("parent error %v", err)
+		}
+		if accepted.Load() != finished.Load() {
+			t.Fatal("accepted worker escaped completion")
+		}
+		if a.Go(ctx, "late", func(context.Context) error { t.Error("late launch"); return nil }) == nil {
+			t.Fatal("late admission")
+		}
+	}
+}
+
+func TestIndependentDescendantCancellation(t *testing.T) {
+	for _, mixed := range []bool{false, true} {
+		t.Run(map[bool]string{false: "cancellation-only", true: "mixed"}[mixed], func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			a := newApp(t, signals, time.Second)
+			canceled := make(chan struct{})
+			allowReturn := make(chan struct{})
+			other := errors.New("other")
+			add(t, a, Module{Name: "owner", Setup: func(ctx context.Context) error {
+				child, cancel := context.WithCancel(ctx)
+				err := a.Go(child, "independent", func(ctx context.Context) error {
+					cancel()
+					close(canceled)
+					<-allowReturn
+					err := ctx.Err()
+					if mixed {
+						err = errors.Join(err, other)
+					}
+					return fmt.Errorf("worker result: %w", err)
+				})
+				if err != nil {
+					cancel()
+				}
+				return err
+			}, Teardown: func(context.Context) error { close(allowReturn); return nil }})
+			done := run(a, context.Background())
+			wait(t, canceled)
+			signals <- syscall.SIGTERM
+			if err := receive(t, done); !errors.Is(err, context.Canceled) || errors.Is(err, other) != mixed {
+				t.Fatalf("independent cancellation lost: %v", err)
+			}
+		})
+	}
+}
+
+func TestParentCancellationDuringShutdown(t *testing.T) {
+	for _, boundary := range []string{"completion", "deadline", "second-signal"} {
+		t.Run(boundary, func(t *testing.T) {
+			iterations := 1
+			if boundary == "completion" {
+				iterations = 1000
+			}
+			for range iterations {
+				parent, cancel := context.WithCancel(context.Background())
+				signals := make(chan os.Signal, 2)
+				timeout := time.Second
+				if boundary == "deadline" {
+					timeout = 20 * time.Millisecond
+				}
+				a := newApp(t, signals, timeout)
+				exited := make(chan struct{})
+				add(t, a, Module{Name: "last", Teardown: func(ctx context.Context) error {
+					defer close(exited)
+					cancel()
+					switch boundary {
+					case "deadline":
+						<-ctx.Done()
+					case "second-signal":
+						signals <- syscall.SIGINT
+						signals <- syscall.SIGTERM
+						<-ctx.Done()
+					}
+					return nil
+				}})
+				err := a.Run(parent)
+				cancel()
+				wait(t, exited)
+				if !errors.Is(err, context.Canceled) {
+					t.Fatalf("parent cancellation lost: %v", err)
+				}
+				if errors.Is(err, context.DeadlineExceeded) != (boundary == "deadline") {
+					t.Fatalf("unexpected shutdown result: %v", err)
+				}
+				parentErrors := 0
+				for _, child := range err.(interface{ Unwrap() []error }).Unwrap() {
+					if child == context.Canceled {
+						parentErrors++
+					}
+				}
+				if parentErrors != 1 {
+					t.Fatalf("parent error recorded %d times: %v", parentErrors, err)
+				}
+			}
+		})
+	}
+}
+
+func TestSuccessfulInterruptedSetupRollsBack(t *testing.T) {
+	signals := make(chan os.Signal, 2)
+	a := newApp(t, signals, time.Second)
+	entered := make(chan struct{})
+	var order []string
+	for _, name := range []string{"first", "interrupted"} {
+		add(t, a, Module{Name: name, Setup: func(ctx context.Context) error {
+			if name == "interrupted" {
+				close(entered)
+				<-ctx.Done()
+			}
+			return nil
+		}, Teardown: func(context.Context) error { order = append(order, name); return nil }})
+	}
+	done := run(a, context.Background())
+	wait(t, entered)
+	signals <- syscall.SIGINT
+	if err := receive(t, done); err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(order, []string{"interrupted", "first"}) {
+		t.Fatalf("rollback %v", order)
+	}
+}
+
+func TestSharedDeadline(t *testing.T) {
+	a := newApp(t, nil, 80*time.Millisecond)
+	var firstDeadline time.Time
+	entered := make(chan struct{})
+	release := make(chan struct{})
+	exited := make(chan struct{})
+	defer func() { close(release); wait(t, exited) }()
+	var skipped atomic.Bool
+	add(t, a, Module{Name: "never", Teardown: func(context.Context) error { skipped.Store(true); return nil }})
+	add(t, a, Module{Name: "blocked", Teardown: func(ctx context.Context) error {
+		deadline, ok := ctx.Deadline()
+		if !ok || !deadline.Equal(firstDeadline) {
+			t.Error("deadline reset between hooks")
+		}
+		close(entered)
+		<-release
+		close(exited)
+		return nil
+	}})
+	add(t, a, Module{Name: "first", Teardown: func(ctx context.Context) error {
+		firstDeadline, _ = ctx.Deadline()
+		time.Sleep(20 * time.Millisecond)
+		return nil
+	}})
+	done := run(a, context.Background())
+	wait(t, entered)
+	if err := receive(t, done); !errors.Is(err, context.DeadlineExceeded) {
+		t.Fatalf("deadline %v", err)
+	}
+	if skipped.Load() {
+		t.Fatal("hook started after abandonment")
+	}
+}
+
+func TestNormalCompletionAdmissionRace(t *testing.T) {
+	for range 50 {
+		a := newApp(t, nil, time.Second)
+		ready := make(chan context.Context, 1)
+		release := make(chan struct{})
+		add(t, a, Module{Name: "service", Run: func(ctx context.Context) error { ready <- ctx; <-release; return nil }})
+		done := run(a, context.Background())
+		ctx := <-ready
+		var accepted, finished atomic.Int32
+		var callers sync.WaitGroup
+		for range 20 {
+			callers.Go(func() {
+				if a.Go(ctx, "racer", func(context.Context) error { finished.Add(1); return nil }) == nil {
+					accepted.Add(1)
+				}
+			})
+		}
+		close(release)
+		callers.Wait()
+		if err := receive(t, done); err != nil {
+			t.Fatal(err)
+		}
+		if accepted.Load() != finished.Load() {
+			t.Fatal("normal completion lost worker")
+		}
+	}
+}
+
+func TestStartupWaitsForSetupDespiteEmptyWorkers(t *testing.T) {
+	a := newApp(t, nil, time.Second)
+	entered := make(chan struct{})
+	release := make(chan struct{})
+	defer func() {
+		select {
+		case <-release:
+		default:
+			close(release)
+		}
+	}()
+	add(t, a, Module{Name: "setup", Setup: func(context.Context) error { close(entered); <-release; return nil }})
+	done := run(a, context.Background())
+	wait(t, entered)
+	if a.Run(context.Background()) == nil {
+		t.Fatal("concurrent Run accepted")
+	}
+	if a.Register(Module{}) == nil {
+		t.Fatal("registration remained open")
+	}
+	select {
+	case err := <-done:
+		t.Fatalf("ended during setup: %v", err)
+	default:
+	}
+	close(release)
+	if err := receive(t, done); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestMixedShutdownErrorPreservesCause(t *testing.T) {
+	signals := make(chan os.Signal, 2)
+	a := newApp(t, signals, time.Second)
+	ready := make(chan struct{})
+	independent := &os.PathError{Op: "read", Path: "queue", Err: io.ErrUnexpectedEOF}
+	add(t, a, Module{Name: "mixed", Run: func(ctx context.Context) error {
+		close(ready)
+		<-ctx.Done()
+		return fmt.Errorf("outer: %w", errors.Join(fmt.Errorf("cancellation: %w", ctx.Err()), independent))
+	}})
+	done := run(a, context.Background())
+	wait(t, ready)
+	signals <- syscall.SIGTERM
+	err := receive(t, done)
+	var pathErr *os.PathError
+	if !errors.As(err, &pathErr) || pathErr != independent || !errors.Is(err, io.ErrUnexpectedEOF) {
+		t.Fatalf("independent cause lost: %v", err)
+	}
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("mixed wrapper was reconstructed: %v", err)
+	}
+}
+
+// matchingError exercises wrapper-owned matching independently of its child.
+type matchingError struct {
+	child error
+	match error
+}
+
+func (e *matchingError) Error() string        { return "custom: " + e.child.Error() }
+func (e *matchingError) Unwrap() error        { return e.child }
+func (e *matchingError) Is(target error) bool { return target == e.match }
+
+func TestMixedShutdownErrorPreservesWrapper(t *testing.T) {
+	for _, kind := range []string{"path", "custom"} {
+		t.Run(kind, func(t *testing.T) {
+			signals := make(chan os.Signal, 2)
+			a := newApp(t, signals, time.Second)
+			ready := make(chan struct{})
+			match := errors.New("custom match")
+			var original error
+			add(t, a, Module{Name: "mixed", Run: func(ctx context.Context) error {
+				close(ready)
+				<-ctx.Done()
+				joined := errors.Join(ctx.Err(), io.ErrUnexpectedEOF)
+				if kind == "path" {
+					original = &os.PathError{Op: "read", Path: "queue", Err: joined}
+				} else {
+					original = &matchingError{child: joined, match: match}
+				}
+				return original
+			}})
+			done := run(a, context.Background())
+			wait(t, ready)
+			signals <- syscall.SIGTERM
+			err := receive(t, done)
+			if !errors.Is(err, original) || !errors.Is(err, io.ErrUnexpectedEOF) {
+				t.Fatalf("wrapper identity or inner failure lost: %v", err)
+			}
+			if kind == "path" {
+				var pathErr *os.PathError
+				if !errors.As(err, &pathErr) || pathErr != original {
+					t.Fatalf("typed wrapper lost: %v", err)
+				}
+			} else {
+				var custom *matchingError
+				if !errors.As(err, &custom) || custom != original || !errors.Is(err, match) {
+					t.Fatalf("custom matching lost: %v", err)
+				}
+			}
+		})
+	}
+}
+
+func TestCancellationOnly(t *testing.T) {
+	for _, err := range []error{
+		context.Canceled,
+		fmt.Errorf("wrapped: %w", context.Canceled),
+		&os.PathError{Op: "read", Path: "queue", Err: errors.Join(context.Canceled, fmt.Errorf("wrapped: %w", context.Canceled))},
+	} {
+		if !cancellationOnly(err, context.Canceled) {
+			t.Errorf("expected cancellation not recognized: %v", err)
+		}
+	}
+	for _, err := range []error{nil, io.ErrUnexpectedEOF, context.DeadlineExceeded, errors.Join(context.Canceled, io.ErrUnexpectedEOF)} {
+		if cancellationOnly(err, context.Canceled) {
+			t.Errorf("independent error classified as cancellation: %v", err)
+		}
+	}
+}

migrate/README.md

@@ -0,0 +1,97 @@
+# migrate
+
+`go.auvem.com/corestack/migrate` sets the house configuration for
+[Goose's Provider API](https://pressly.github.io/goose/documentation/provider/).
+It returns `*goose.Provider` directly: Goose owns execution, version tracking,
+status, and errors. There is no lifecycle dependency or background work.
+
+Create SQL migration files with Goose's
+[`create` command](https://pressly.github.io/goose/documentation/cli-commands/#create).
+For timestamp-to-sequential reconciliation before deployment, use its
+[`fix` command](https://pressly.github.io/goose/documentation/cli-commands/#fix)
+as described in [hybrid versioning](https://github.com/pressly/goose#hybrid-versioning).
+These commands edit source files before embedding; `fix` does not update database
+history. Never renumber migrations already applied to shared databases.
+
+**Goose's default Go template is not compatible unchanged with this package.**
+It registers migrations globally from `init`, while this package uses explicit
+provider-local registration. Until the compatible authoring CLI planned in
+[#9](https://gitea.auvem.com/corestack/go/issues/9) is available, Go migrations
+require the adaptation described below; do not treat stock `goose create ... go`
+output as ready to use. That follow-up must supply and document the supported
+creation/reconciliation workflow before it is complete.
+
+Embed migrations in the application's binary and run them before serving traffic:
+
+```go
+package app
+
+import (
+    "context"
+    "database/sql"
+    "embed"
+    "log/slog"
+
+    "github.com/pressly/goose/v3"
+    "go.auvem.com/corestack/migrate"
+)
+
+//go:embed migrations/*.sql
+var migrations embed.FS
+
+func migrateDatabase(ctx context.Context, db *sql.DB, logger *slog.Logger) error {
+    provider, err := migrate.New(db, goose.DialectPostgres, migrations, "migrations", logger)
+    if err != nil {
+        return err
+    }
+    _, err = provider.Up(ctx)
+    return err
+}
+```
+
+The caller opens and closes `db`, selects a matching database driver and dialect,
+supplies a nonnil logger, and controls the operation context/deadline. Construction
+is offline; SQL is parsed lazily by Goose. `Provider.Close` also closes `db`, so do
+not defer it when sharing the pool with the application. Use `"."` for SQL files
+at the embedded root. Files in the selected directory are discovered directly,
+without recursively searching subdirectories.
+
+Preserve Goose's creator/fix filenames and ship the complete migration history.
+The pinned Goose SQL-only provider relies on lexical filename order matching
+numeric version order. Timestamp versions and gaps are supported; never derive
+versions from file counts. For operations, errors, and SQL annotations, use the
+[Provider API](https://pkg.go.dev/github.com/pressly/goose/v3#Provider) and
+[SQL migration docs](https://pressly.github.io/goose/documentation/annotations/).
+
+For Go functions, use Goose's
+[provider-local registration](https://pressly.github.io/goose/documentation/provider/#withgomigrations):
+pass fresh `goose.NewGoMigration` values as the trailing arguments to `migrate.New`.
+The creator's default Go template instead calls `goose.AddMigrationContext` from
+`init`; replace that registration with provider-local construction. Global
+registration is disabled to keep each provider's migration set isolated and avoid
+import side effects. If `fix` renames Go migrations, update their explicit
+registration versions to match. Versions must be unique across SQL and Go files.
+
+Postgres providers automatically use Goose's default session advisory locker.
+Concurrent startup calls from separate providers/processes serialize migration
+execution and recheck applied versions under the lock. The default lock ID
+serializes Goose migrations throughout the same database, including different
+schemas. Use a direct connection or a session-pooling proxy: transaction pooling
+cannot preserve session locks.
+`RunDB` Go migrations need spare pool connections while the locked session is
+held; avoid a one-connection pool for them.
+
+Other dialects have no cross-provider/process lock configured by this package.
+Serialize migration runs externally, for example with a single deployment job.
+SQLite tests validate the SQL convention, not concurrent daemon startup safety.
+
+Run the integration suite against an existing Postgres database with schema
+creation privileges:
+
+```sh
+MIGRATE_POSTGRES_DSN='postgres://user:password@localhost/testdb?sslmode=disable' go test -race ./migrate
+```
+
+Tests create and clean only random schemas they own. Without a DSN, Postgres
+tests skip locally; in CI a missing DSN fails, and the CI job supplies a Postgres
+service. SQLite tests always run in process using temporary databases.

migrate/migrate.go

@@ -0,0 +1,65 @@
+// Package migrate configures Goose providers for embedded application migrations.
+// Applications own their database, migration files, and startup ordering.
+package migrate
+
+import (
+	"database/sql"
+	"embed"
+	"fmt"
+	"io/fs"
+	"log/slog"
+
+	"github.com/pressly/goose/v3"
+	"github.com/pressly/goose/v3/lock"
+)
+
+// New returns a provider for SQL files in dir and optional provider-local Go
+// migrations. Pass "." for files at the embedded root and a nonnil logger.
+// The selected directory must exist, including when using only Go migrations.
+// Construction does not connect to db; the caller owns and closes db.
+//
+// PostgreSQL uses Goose's session advisory locker with its default lock ID and
+// retry limits. Other dialects require the caller to serialize migration runs
+// across providers/processes. PostgreSQL connections must preserve session
+// affinity (transaction-pooling proxies cannot safely hold session locks).
+//
+// Use the returned Provider's Up, UpTo, DownTo, Status, GetDBVersion, GetVersions,
+// and HasPending methods directly. Create migration files with Goose's create
+// command; lexical filename order must match numeric version order. Go migrations
+// are registered per provider; global Go registration is ignored.
+func New(db *sql.DB, dialect goose.Dialect, files embed.FS, dir string, logger *slog.Logger, migrations ...*goose.Migration) (*goose.Provider, error) {
+	for i, migration := range migrations {
+		if migration == nil {
+			return nil, fmt.Errorf("migrate: Go migration %d must not be nil", i)
+		}
+	}
+	root, err := fs.Sub(files, dir)
+	if err != nil {
+		return nil, fmt.Errorf("migrate: directory %q: %w", dir, err)
+	}
+	info, err := fs.Stat(root, ".")
+	if err != nil {
+		return nil, fmt.Errorf("migrate: directory %q: %w", dir, err)
+	}
+	if !info.IsDir() {
+		return nil, fmt.Errorf("migrate: directory %q: not a directory", dir)
+	}
+	opts := []goose.ProviderOption{
+		goose.WithDisableGlobalRegistry(true),
+		goose.WithGoMigrations(migrations...),
+		goose.WithSlog(logger),
+		goose.WithVerbose(true),
+	}
+	if dialect == goose.DialectPostgres {
+		locker, err := lock.NewPostgresSessionLocker()
+		if err != nil {
+			return nil, fmt.Errorf("migrate: postgres locker: %w", err)
+		}
+		opts = append(opts, goose.WithSessionLocker(locker))
+	}
+	provider, err := goose.NewProvider(dialect, db, root, opts...)
+	if err != nil {
+		return nil, fmt.Errorf("migrate: new provider: %w", err)
+	}
+	return provider, nil
+}

migrate/migrate_test.go

@@ -0,0 +1,457 @@
+package migrate_test
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"database/sql"
+	"embed"
+	"errors"
+	"io"
+	"io/fs"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/stdlib"
+	"github.com/pressly/goose/v3"
+	_ "modernc.org/sqlite"
+
+	"go.auvem.com/corestack/migrate"
+)
+
+// invariant: embedded fixtures are read-only; no test mutates shared migration state.
+//
+//go:embed testdata
+var fixtures embed.FS
+
+func TestSQLite(t *testing.T) {
+	for _, test := range []struct {
+		name string
+		run  func(*testing.T, *sql.DB, goose.Dialect)
+	}{
+		{"flow", testFlow}, {"sql-only", testSQLOnly}, {"failure", testFailure},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			db, err := sql.Open("sqlite", filepath.Join(t.TempDir(), "migrate.db"))
+			if err != nil {
+				t.Fatal(err)
+			}
+			t.Cleanup(func() {
+				if err := db.Close(); err != nil {
+					t.Error(err)
+				}
+			})
+			test.run(t, db, goose.DialectSQLite3)
+		})
+	}
+}
+
+func TestPostgres(t *testing.T) {
+	for _, test := range []struct {
+		name string
+		run  func(*testing.T, *sql.DB, goose.Dialect)
+	}{
+		{"flow", testFlow}, {"sql-only", testSQLOnly}, {"failure", testFailure},
+	} {
+		t.Run(test.name, func(t *testing.T) { test.run(t, postgresDatabase(t)(), goose.DialectPostgres) })
+	}
+}
+
+func testFlow(t *testing.T, db *sql.DB, dialect goose.Dialect) {
+	t.Helper()
+	ctx, cancel := context.WithTimeout(t.Context(), time.Minute)
+	defer cancel()
+	var logs bytes.Buffer
+	goMigration := goose.NewGoMigration(20261027120000,
+		&goose.GoFunc{RunTx: func(ctx context.Context, tx *sql.Tx) error {
+			_, err := tx.ExecContext(ctx, "INSERT INTO migration_events (version) VALUES (20261027120000)")
+			return err
+		}},
+		&goose.GoFunc{RunTx: func(ctx context.Context, tx *sql.Tx) error {
+			_, err := tx.ExecContext(ctx, "DELETE FROM migration_events WHERE version = 20261027120000")
+			return err
+		}})
+	p, err := migrate.New(db, dialect, fixtures, "testdata/migrations", slog.New(slog.NewJSONHandler(&logs, nil)), goMigration)
+	if err != nil {
+		t.Fatal(err)
+	}
+	versions := []int64{7, 20261026093000, 20261027114500, 20261027120000}
+	// Registering on one provider must not leak into another provider in the same process.
+	other := newProvider(t, db, dialect, "testdata/migrations")
+	if len(other.ListSources()) != 3 {
+		t.Fatal("Go migration leaked to another provider")
+	}
+	assertState(t, ctx, p, 0, versions, 0)
+	results, err := p.UpTo(ctx, versions[1])
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertResults(t, results, versions[:2])
+	assertState(t, ctx, p, versions[1], versions, 2)
+	results, err = p.Up(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertResults(t, results, versions[2:])
+	assertState(t, ctx, p, versions[3], versions, 4)
+	assertEvents(t, ctx, db, versions)
+	results, err = p.Up(ctx)
+	if err != nil || len(results) != 0 {
+		t.Fatalf("idempotent Up = %v, %v", results, err)
+	}
+	results, err = p.DownTo(ctx, versions[1])
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertResults(t, results, []int64{versions[3], versions[2]})
+	assertState(t, ctx, p, versions[1], versions, 2)
+	assertEvents(t, ctx, db, versions[:2])
+	results, err = p.DownTo(ctx, versions[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertResults(t, results, []int64{versions[1]})
+	assertState(t, ctx, p, versions[0], versions, 1)
+	assertEvents(t, ctx, db, versions[:1])
+	if _, err := p.DownTo(ctx, 0); err != nil {
+		t.Fatal(err)
+	}
+	assertState(t, ctx, p, 0, versions, 0)
+	results, err = p.Up(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertResults(t, results, versions)
+	assertEvents(t, ctx, db, versions)
+	if !strings.Contains(logs.String(), `"logger":"goose"`) || !strings.Contains(logs.String(), `"version":20261027114500`) {
+		t.Fatalf("missing structured migration logs: %s", logs.String())
+	}
+}
+
+func testSQLOnly(t *testing.T, db *sql.DB, dialect goose.Dialect) {
+	t.Helper()
+	ctx, cancel := context.WithTimeout(t.Context(), time.Minute)
+	defer cancel()
+	for _, test := range []struct {
+		dir      string
+		versions []int64
+	}{
+		{"testdata/numeric", []int64{7, 10}},
+		{"testdata/migrations", []int64{7, 20261026093000, 20261027114500}},
+	} {
+		p := newProvider(t, db, dialect, test.dir)
+		assertState(t, ctx, p, 0, test.versions, 0)
+		results, err := p.UpTo(ctx, test.versions[1]-1)
+		if err != nil {
+			t.Fatal(err)
+		}
+		assertResults(t, results, test.versions[:1])
+		assertState(t, ctx, p, test.versions[0], test.versions, 1)
+		results, err = p.Up(ctx)
+		if err != nil {
+			t.Fatal(err)
+		}
+		assertResults(t, results, test.versions[1:])
+		assertState(t, ctx, p, test.versions[len(test.versions)-1], test.versions, len(test.versions))
+		assertEvents(t, ctx, db, test.versions)
+		results, err = p.DownTo(ctx, test.versions[1]-1)
+		if err != nil {
+			t.Fatal(err)
+		}
+		wantDown := slices.Clone(test.versions[1:])
+		slices.Reverse(wantDown)
+		assertResults(t, results, wantDown)
+		assertState(t, ctx, p, test.versions[0], test.versions, 1)
+		if _, err := p.DownTo(ctx, 0); err != nil {
+			t.Fatal(err)
+		}
+		assertState(t, ctx, p, 0, test.versions, 0)
+	}
+}
+
+func testFailure(t *testing.T, db *sql.DB, dialect goose.Dialect) {
+	t.Helper()
+	ctx, cancel := context.WithTimeout(t.Context(), time.Minute)
+	defer cancel()
+	p := newProvider(t, db, dialect, "testdata/failure")
+	_, err := p.Up(ctx)
+	var partial *goose.PartialError
+	if !errors.As(err, &partial) || partial.Failed.Source.Version != 20261027114500 ||
+		!strings.Contains(err.Error(), "missing_migration_table") || !strings.Contains(err.Error(), "20261027114500") {
+		t.Fatalf("expected clear failed timestamp migration error, got %v", err)
+	}
+	assertResults(t, partial.Applied, []int64{7, 20261026093000})
+	assertState(t, ctx, p, 20261026093000, []int64{7, 20261026093000, 20261027114500}, 2)
+	assertEvents(t, ctx, db, []int64{7, 20261026093000})
+	// A second attempt must fail at the same version without repeating committed work.
+	if _, err := p.Up(ctx); err == nil {
+		t.Fatal("retry unexpectedly succeeded")
+	}
+	assertEvents(t, ctx, db, []int64{7, 20261026093000})
+}
+
+func newProvider(t *testing.T, db *sql.DB, dialect goose.Dialect, dir string, migrations ...*goose.Migration) *goose.Provider {
+	t.Helper()
+	p, err := migrate.New(db, dialect, fixtures, dir, slog.New(slog.NewTextHandler(io.Discard, nil)), migrations...)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return p
+}
+
+func assertState(t *testing.T, ctx context.Context, p *goose.Provider, current int64, versions []int64, applied int) {
+	t.Helper()
+	var sources []int64
+	for _, source := range p.ListSources() {
+		sources = append(sources, source.Version)
+	}
+	if !slices.Equal(sources, versions) {
+		t.Fatalf("ListSources = %v; want %v", sources, versions)
+	}
+	got, err := p.GetDBVersion(ctx)
+	if err != nil || got != current {
+		t.Fatalf("GetDBVersion = %d, %v; want %d", got, err, current)
+	}
+	got, latest, err := p.GetVersions(ctx)
+	if err != nil || got != current || latest != versions[len(versions)-1] {
+		t.Fatalf("GetVersions = %d, %d, %v", got, latest, err)
+	}
+	pending, err := p.HasPending(ctx)
+	if err != nil || pending != (applied < len(versions)) {
+		t.Fatalf("HasPending = %v, %v", pending, err)
+	}
+	status, err := p.Status(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(status) != len(versions) {
+		t.Fatalf("Status length = %d; want %d", len(status), len(versions))
+	}
+	for i, s := range status {
+		want := goose.StatePending
+		if i < applied {
+			want = goose.StateApplied
+		}
+		if s.Source.Version != versions[i] || s.State != want {
+			t.Fatalf("Status[%d] = %+v, version %d; want %s, %d", i, s, s.Source.Version, want, versions[i])
+		}
+	}
+}
+
+func assertResults(t *testing.T, results []*goose.MigrationResult, want []int64) {
+	t.Helper()
+	got := make([]int64, 0, len(results))
+	for _, r := range results {
+		got = append(got, r.Source.Version)
+	}
+	if !slices.Equal(got, want) {
+		t.Fatalf("applied versions = %v; want %v", got, want)
+	}
+}
+
+func assertEvents(t *testing.T, ctx context.Context, db *sql.DB, want []int64) {
+	t.Helper()
+	rows, err := db.QueryContext(ctx, "SELECT version FROM migration_events ORDER BY version")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	var got []int64
+	for rows.Next() {
+		var v int64
+		if err := rows.Scan(&v); err != nil {
+			t.Fatal(err)
+		}
+		got = append(got, v)
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatal(err)
+	}
+	if !slices.Equal(got, want) {
+		t.Fatalf("events = %v; want %v", got, want)
+	}
+}
+
+// postgresDatabase owns only its random schema, never the supplied database.
+func postgresDatabase(t *testing.T) func() *sql.DB {
+	t.Helper()
+	dsn := os.Getenv("MIGRATE_POSTGRES_DSN")
+	if dsn == "" {
+		if os.Getenv("CI") != "" {
+			t.Fatal("MIGRATE_POSTGRES_DSN is required in CI")
+		}
+		t.Skip("set MIGRATE_POSTGRES_DSN to run Postgres integration tests")
+	}
+	config, err := pgx.ParseConfig(dsn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	admin := stdlib.OpenDB(*config)
+	t.Cleanup(func() {
+		if err := admin.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	schema := "migrate_" + strings.ToLower(rand.Text())
+	ctx, cancel := context.WithTimeout(t.Context(), time.Minute)
+	defer cancel()
+	if _, err := admin.ExecContext(ctx, "CREATE SCHEMA "+schema); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+		defer cancel()
+		if _, err := admin.ExecContext(ctx, "DROP SCHEMA "+schema+" CASCADE"); err != nil {
+			t.Error(err)
+		}
+	})
+	config.RuntimeParams["search_path"] = schema
+	return func() *sql.DB {
+		db := stdlib.OpenDB(*config)
+		t.Cleanup(func() {
+			if err := db.Close(); err != nil {
+				t.Error(err)
+			}
+		})
+		return db
+	}
+}
+
+func TestPostgresConcurrentUp(t *testing.T) {
+	open := postgresDatabase(t)
+	ctx, cancel := context.WithTimeout(t.Context(), time.Minute)
+	defer cancel()
+	const workers = 4
+	providers := make([]*goose.Provider, workers)
+	for i := range providers {
+		// Each provider owns a distinct pool and Go migration instance, like separate daemons.
+		pause := goose.NewGoMigration(3, &goose.GoFunc{RunTx: func(ctx context.Context, tx *sql.Tx) error {
+			_, err := tx.ExecContext(ctx, "SELECT pg_sleep(0.2)")
+			return err
+		}}, nil)
+		providers[i] = newProvider(t, open(), goose.DialectPostgres, "testdata/migrations", pause)
+	}
+	type outcome struct {
+		results []*goose.MigrationResult
+		err     error
+	}
+	start := make(chan struct{})
+	done := make(chan outcome, workers)
+	for _, p := range providers {
+		go func() {
+			select {
+			case <-start:
+			case <-ctx.Done():
+				done <- outcome{err: ctx.Err()}
+				return
+			}
+			results, err := p.Up(ctx)
+			done <- outcome{results, err}
+		}()
+	}
+	close(start)
+	var applied []int64
+	for range workers {
+		result := <-done
+		if result.err != nil {
+			t.Error(result.err)
+		}
+		for _, r := range result.results {
+			applied = append(applied, r.Source.Version)
+		}
+	}
+	slices.Sort(applied)
+	if want := []int64{3, 7, 20261026093000, 20261027114500}; !slices.Equal(applied, want) {
+		t.Fatalf("concurrent Up applied = %v; want exactly once each: %v", applied, want)
+	}
+	assertEvents(t, ctx, open(), []int64{7, 20261026093000, 20261027114500})
+	for _, p := range providers {
+		assertState(t, ctx, p, 20261027114500, applied, len(applied))
+	}
+}
+
+func TestConstructor(t *testing.T) {
+	db, err := sql.Open("sqlite", ":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	for _, test := range []struct {
+		name       string
+		db         *sql.DB
+		dialect    goose.Dialect
+		dir        string
+		logger     *slog.Logger
+		migrations []*goose.Migration
+		contains   string
+	}{
+		{name: "nil database", dialect: goose.DialectSQLite3, dir: "testdata/migrations", logger: logger, contains: "db must not be nil"},
+		{name: "nil logger", db: db, dialect: goose.DialectSQLite3, dir: "testdata/migrations", contains: "slog logger must not be nil"},
+		{name: "invalid directory", db: db, dialect: goose.DialectSQLite3, dir: "../migrations", logger: logger, contains: "directory"},
+		{name: "missing directory", db: db, dialect: goose.DialectSQLite3, dir: "missing", logger: logger, contains: "migrate:"},
+		{name: "invalid dialect", db: db, dialect: "unknown", dir: "testdata/migrations", logger: logger, contains: "dialect"},
+		{name: "nil migration", db: db, dialect: goose.DialectSQLite3, dir: "testdata/migrations", logger: logger, migrations: []*goose.Migration{nil}, contains: "must not be nil"},
+		{name: "duplicate version", db: db, dialect: goose.DialectSQLite3, dir: "testdata/migrations", logger: logger, migrations: []*goose.Migration{goose.NewGoMigration(7, nil, nil)}, contains: "7"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			p, err := migrate.New(test.db, test.dialect, fixtures, test.dir, test.logger, test.migrations...)
+			if err == nil || p != nil || !strings.Contains(err.Error(), test.contains) {
+				t.Fatalf("New = %v, %v; want error containing %q", p, err, test.contains)
+			}
+		})
+	}
+	// Construction and validation are offline, even when the database is closed.
+	if err := db.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := migrate.New(db, goose.DialectSQLite3, fixtures, "testdata/migrations", logger); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestConstructorDirectory(t *testing.T) {
+	db, err := sql.Open("sqlite", ":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Directory validation and Go-only construction must remain offline.
+	if err := db.Close(); err != nil {
+		t.Fatal(err)
+	}
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	for _, test := range []struct {
+		dir     string
+		wantErr string
+	}{
+		{dir: "missing", wantErr: "directory"},
+		{dir: "testdata/migrations/00007_events.sql", wantErr: "not a directory"},
+		{dir: "."},
+		{dir: "testdata"},
+	} {
+		t.Run(test.dir, func(t *testing.T) {
+			p, err := migrate.New(db, goose.DialectSQLite3, fixtures, test.dir, logger, goose.NewGoMigration(10, nil, nil))
+			if test.wantErr != "" {
+				if err == nil || p != nil || !strings.Contains(err.Error(), test.wantErr) || !strings.Contains(err.Error(), test.dir) {
+					t.Fatalf("New = %v, %v; want directory error containing %q and %q", p, err, test.wantErr, test.dir)
+				}
+				if test.dir == "missing" && !errors.Is(err, fs.ErrNotExist) {
+					t.Fatalf("New error = %v; want fs.ErrNotExist", err)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			if sources := p.ListSources(); len(sources) != 1 || sources[0].Version != 10 {
+				t.Fatalf("ListSources = %v; want Go migration 10 only", sources)
+			}
+		})
+	}
+}

migrate/testdata/failure/00007_events.sql

@@ -0,0 +1,6 @@
+-- +goose Up
+CREATE TABLE migration_events (version BIGINT PRIMARY KEY);
+INSERT INTO migration_events (version) VALUES (7);
+
+-- +goose Down
+DROP TABLE migration_events;

migrate/testdata/failure/20261026093000_second.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+INSERT INTO migration_events (version) VALUES (20261026093000);
+
+-- +goose Down
+DELETE FROM migration_events WHERE version = 20261026093000;

migrate/testdata/failure/20261027114500_broken.sql

@@ -0,0 +1,6 @@
+-- +goose Up
+INSERT INTO migration_events (version) VALUES (20261027114500);
+INSERT INTO missing_migration_table (version) VALUES (20261027114500);
+
+-- +goose Down
+DELETE FROM migration_events WHERE version = 20261027114500;

migrate/testdata/migrations/00007_events.sql

@@ -0,0 +1,6 @@
+-- +goose Up
+CREATE TABLE migration_events (version BIGINT PRIMARY KEY);
+INSERT INTO migration_events (version) VALUES (7);
+
+-- +goose Down
+DROP TABLE migration_events;

migrate/testdata/migrations/20261026093000_second.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+INSERT INTO migration_events (version) VALUES (20261026093000);
+
+-- +goose Down
+DELETE FROM migration_events WHERE version = 20261026093000;

migrate/testdata/migrations/20261027114500_third.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+INSERT INTO migration_events (version) VALUES (20261027114500);
+
+-- +goose Down
+DELETE FROM migration_events WHERE version = 20261027114500;

migrate/testdata/numeric/00007_events.sql

@@ -0,0 +1,6 @@
+-- +goose Up
+CREATE TABLE migration_events (version BIGINT PRIMARY KEY);
+INSERT INTO migration_events (version) VALUES (7);
+
+-- +goose Down
+DROP TABLE migration_events;

migrate/testdata/numeric/00010_event.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+INSERT INTO migration_events (version) VALUES (10);
+
+-- +goose Down
+DELETE FROM migration_events WHERE version = 10;

page/cursor.go

@@ -0,0 +1,216 @@
+package page
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+	"unicode/utf8"
+	"uuid"
+)
+
+const maxCursorBytes = 16384
+
+// CursorError identifies malformed, version, sort, value, or size cursor failures via
+// Kind. It intentionally omits cursor payloads from its message.
+type CursorError struct{ Kind string }
+
+// Error implements error without including cursor contents.
+func (e *CursorError) Error() string { return "page: cursor " + e.Kind }
+
+// ValueError identifies an unsupported concrete type or invalid supported value
+// at Position in the row key, without exposing the value itself.
+type ValueError struct {
+	Position int
+	Type     string
+}
+
+// Error implements error without including key values.
+func (e *ValueError) Error() string {
+	return fmt.Sprintf("page: invalid key value at %d (%s)", e.Position, e.Type)
+}
+
+type envelope struct {
+	Version int         `json:"v"`
+	Sort    string      `json:"sort"`
+	Values  [][2]string `json:"values"`
+}
+
+func encodeCursor(sortID string, values []any) (string, error) {
+	e := envelope{Version: 1, Sort: sortID, Values: make([][2]string, len(values))}
+	for i, v := range values {
+		pair, ok := encodeValue(v)
+		if !ok {
+			return "", &ValueError{Position: i, Type: fmt.Sprintf("%T", v)}
+		}
+		e.Values[i] = pair
+	}
+	data, err := json.Marshal(e)
+	if err != nil {
+		return "", &CursorError{Kind: "malformed"}
+	}
+	if base64.RawURLEncoding.EncodedLen(len(data)) > maxCursorBytes {
+		return "", &CursorError{Kind: "size"}
+	}
+	return base64.RawURLEncoding.EncodeToString(data), nil
+}
+
+func encodeValue(value any) ([2]string, bool) {
+	var tag, payload string
+	switch v := value.(type) {
+	case int:
+		tag, payload = "int", strconv.FormatInt(int64(v), 10)
+	case int8:
+		tag, payload = "int8", strconv.FormatInt(int64(v), 10)
+	case int16:
+		tag, payload = "int16", strconv.FormatInt(int64(v), 10)
+	case int32:
+		tag, payload = "int32", strconv.FormatInt(int64(v), 10)
+	case int64:
+		tag, payload = "int64", strconv.FormatInt(v, 10)
+	case string:
+		if !utf8.ValidString(v) {
+			return [2]string{}, false
+		}
+		tag, payload = "string", v
+	case time.Time:
+		v = v.UTC()
+		if v.Year() < 0 || v.Year() > 9999 {
+			return [2]string{}, false
+		}
+		tag, payload = "time", v.Format(time.RFC3339Nano)
+	case uuid.UUID:
+		tag, payload = "uuid", v.String()
+	default:
+		return [2]string{}, false
+	}
+	return [2]string{tag, payload}, true
+}
+
+func decodeCursor(token string, sort Sort) ([]any, error) {
+	failure := func(kind string) ([]any, error) { return nil, &CursorError{Kind: kind} }
+	if len(token) > maxCursorBytes {
+		return failure("size")
+	}
+	data, err := base64.RawURLEncoding.Strict().DecodeString(token)
+	if err != nil || !utf8.Valid(data) || base64.RawURLEncoding.EncodeToString(data) != token {
+		return failure("malformed")
+	}
+	// invariant: exactly three distinct envelope fields; struct decoding alone permits duplicates.
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	start, err := decoder.Token()
+	if err != nil || start != json.Delim('{') {
+		return failure("malformed")
+	}
+	fields := make(map[string]json.RawMessage, 3)
+	for decoder.More() {
+		name, err := decoder.Token()
+		if err != nil {
+			return failure("malformed")
+		}
+		key, ok := name.(string)
+		if !ok || (key != "v" && key != "sort" && key != "values") {
+			return failure("malformed")
+		}
+		if _, exists := fields[key]; exists {
+			return failure("malformed")
+		}
+		var raw json.RawMessage
+		if decoder.Decode(&raw) != nil {
+			return failure("malformed")
+		}
+		fields[key] = raw
+	}
+	if _, err := decoder.Token(); err != nil || len(fields) != 3 {
+		return failure("malformed")
+	}
+	if _, err := decoder.Token(); err != io.EOF {
+		return failure("malformed")
+	}
+	var version int
+	if bytes.Equal(fields["v"], []byte("null")) || json.Unmarshal(fields["v"], &version) != nil {
+		return failure("malformed")
+	}
+	if version != 1 {
+		return failure("version")
+	}
+	var id string
+	if !jsonString(fields["sort"], &id) {
+		return failure("malformed")
+	}
+	if id != sort.ID {
+		return failure("sort")
+	}
+	var entries []json.RawMessage
+	if len(fields["values"]) == 0 || fields["values"][0] != '[' || json.Unmarshal(fields["values"], &entries) != nil || len(entries) != len(sort.Columns) {
+		return failure("malformed")
+	}
+	values := make([]any, len(entries))
+	for i, entry := range entries {
+		var pair []json.RawMessage
+		if len(entry) == 0 || entry[0] != '[' || json.Unmarshal(entry, &pair) != nil || len(pair) != 2 {
+			return failure("malformed")
+		}
+		var tag, payload string
+		if !jsonString(pair[0], &tag) || !jsonString(pair[1], &payload) {
+			return failure("malformed")
+		}
+		value, ok := decodeValue(tag, payload)
+		if !ok {
+			return failure("value")
+		}
+		values[i] = value
+	}
+	return values, nil
+}
+
+func jsonString(raw json.RawMessage, value *string) bool {
+	return len(raw) > 0 && raw[0] == '"' && json.Unmarshal(raw, value) == nil && utf8.ValidString(*value)
+}
+
+func decodeValue(tag, payload string) (any, bool) {
+	switch tag {
+	case "int", "int8", "int16", "int32", "int64":
+		bits := strconv.IntSize
+		switch tag {
+		case "int8":
+			bits = 8
+		case "int16":
+			bits = 16
+		case "int32":
+			bits = 32
+		case "int64":
+			bits = 64
+		}
+		n, err := strconv.ParseInt(payload, 10, bits)
+		if err != nil || strconv.FormatInt(n, 10) != payload {
+			return nil, false
+		}
+		switch tag {
+		case "int":
+			return int(n), true
+		case "int8":
+			return int8(n), true
+		case "int16":
+			return int16(n), true
+		case "int32":
+			return int32(n), true
+		default:
+			return n, true
+		}
+	case "string":
+		return payload, utf8.ValidString(payload)
+	case "time":
+		t, err := time.Parse(time.RFC3339Nano, payload)
+		t = t.UTC()
+		return t, err == nil && t.Year() >= 0 && t.Year() <= 9999
+	case "uuid":
+		id, err := uuid.Parse(payload)
+		return id, err == nil && id.String() == payload
+	default:
+		return nil, false
+	}
+}

page/cursor_test.go

@@ -0,0 +1,220 @@
+package page
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"math"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+	"uuid"
+
+	"github.com/stephenafamo/bob"
+	"github.com/stephenafamo/bob/dialect/psql"
+	pd "github.com/stephenafamo/bob/dialect/psql/dialect"
+	"github.com/stephenafamo/bob/expr"
+)
+
+func scalarSort() Sort {
+	return Sort{ID: "scalar/v1", Columns: []Column{{Expression: expr.Quote("id"), Unique: true}}}
+}
+
+func TestSupportedValues(t *testing.T) {
+	instant := time.Date(2026, 10, 27, 12, 34, 56, 123456789, time.FixedZone("odd", 3661))
+	values := []any{
+		int(0), int(math.MaxInt), int(math.MinInt), int8(math.MinInt8), int8(math.MaxInt8),
+		int16(math.MinInt16), int16(math.MaxInt16), int32(math.MinInt32), int32(math.MaxInt32),
+		int64(math.MinInt64), int64(math.MaxInt64), int64(9007199254740993), "", "こんにちは\x00' OR 1=1 --",
+		instant, time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC), time.Date(9999, 12, 31, 23, 59, 59, 999999999, time.UTC),
+		uuid.MustParse("01234567-89ab-cdef-0123-456789abcdef"), uuid.Nil(),
+	}
+	for _, value := range values {
+		t.Run(reflect.TypeOf(value).String(), func(t *testing.T) {
+			token, err := encodeCursor("scalar/v1", []any{value})
+			if err != nil {
+				t.Fatal(err)
+			}
+			decoded, err := decodeCursor(token, scalarSort())
+			if err != nil {
+				t.Fatal(err)
+			}
+			expected := value
+			if v, ok := value.(time.Time); ok {
+				expected = v.UTC()
+			}
+			if !reflect.DeepEqual(decoded, []any{expected}) {
+				t.Fatalf("type/value: got %#v want %#v", decoded, expected)
+			}
+			p, err := Prepare(scalarSort(), func(v any) []any { return []any{v} }, Request{Cursor: token}, Limits{Default: 1, Maximum: 2})
+			if err != nil {
+				t.Fatal(err)
+			}
+			q := psql.Select(Mod[*pd.SelectQuery](p))
+			_, args, err := bob.Build(t.Context(), q)
+			if err != nil || !reflect.DeepEqual(args, decoded) {
+				t.Fatalf("bound values: %#v %v", args, err)
+			}
+			if tm, ok := expected.(time.Time); ok {
+				data, _ := base64.RawURLEncoding.DecodeString(token)
+				if !strings.Contains(string(data), tm.Format(time.RFC3339Nano)) {
+					t.Fatalf("non-UTC timestamp: %s", data)
+				}
+			}
+		})
+	}
+}
+
+func TestUnsupportedValues(t *testing.T) {
+	type named int64
+	n := 1
+	values := []any{nil, named(1), uint(1), uint64(1), float64(1), true, &n, []byte("x"), struct{}{}, "\xff", time.Date(-1, 1, 1, 0, 0, 0, 0, time.UTC), time.Date(10000, 1, 1, 0, 0, 0, 0, time.UTC)}
+	for _, value := range values {
+		p, err := Prepare(scalarSort(), func(v any) []any { return []any{v} }, Request{}, Limits{Default: 1, Maximum: 2})
+		if err != nil {
+			t.Fatal(err)
+		}
+		result, err := p.Page([]any{value})
+		var valueError *ValueError
+		if !errors.As(err, &valueError) || valueError.Position != 0 || !reflect.DeepEqual(result, Page[any]{}) {
+			t.Fatalf("%T: %+v %v", value, result, err)
+		}
+	}
+	type alias = int64
+	if _, err := encodeCursor("scalar/v1", []any{alias(1)}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestMalformedCursors(t *testing.T) {
+	valid := `{"v":1,"sort":"scalar/v1","values":[["int64","1"]]}`
+	cases := []struct{ data, kind string }{
+		{`null`, "malformed"}, {`[]`, "malformed"}, {`{`, "malformed"},
+		{valid + ` {}`, "malformed"},
+		{strings.Replace(valid, `"v":1`, `"v":2`, 1), "version"},
+		{strings.Replace(valid, `"v":1`, `"v":null`, 1), "malformed"},
+		{strings.Replace(valid, `"v":1`, `"v":1,"v":1`, 1), "malformed"},
+		{strings.Replace(valid, `"v":1,`, ``, 1), "malformed"},
+		{strings.Replace(valid, `"v":1`, `"v":1,"columns":[]`, 1), "malformed"},
+		{strings.Replace(valid, `scalar/v1`, `other/v1`, 1), "sort"},
+		{strings.Replace(valid, `"scalar/v1"`, `null`, 1), "malformed"},
+		{strings.Replace(valid, `[["int64","1"]]`, `null`, 1), "malformed"},
+		{strings.Replace(valid, `[["int64","1"]]`, `[]`, 1), "malformed"},
+		{strings.Replace(valid, `[["int64","1"]]`, `[["int64","1"],["int64","2"]]`, 1), "malformed"},
+	}
+	for _, entry := range []string{`null`, `{}`, `{"type":"int64","value":"1"}`, `[]`, `["int64"]`, `["int64","1","x"]`, `[null,"1"]`, `["int64",null]`, `["int64",1]`, `[1,"1"]`} {
+		cases = append(cases, struct{ data, kind string }{strings.Replace(valid, `["int64","1"]`, entry, 1), "malformed"})
+	}
+	for _, pair := range [][2]string{{"what", "1"}, {"int8", "128"}, {"int8", "-129"}, {"int16", "32768"}, {"int32", "2147483648"}, {"int64", "9223372036854775808"}, {"int", "999999999999999999999"}, {"int64", "01"}, {"int64", "+1"}, {"int64", "-0"}, {"int64", "1.0"}, {"time", "10000-01-01T00:00:00Z"}, {"time", "yesterday"}, {"time", "9999-12-31T23:59:59-01:00"}, {"time", "0000-01-01T00:00:00+01:00"}, {"uuid", "broken"}} {
+		data, _ := json.Marshal(pair)
+		cases = append(cases, struct{ data, kind string }{strings.Replace(valid, `["int64","1"]`, string(data), 1), "value"})
+	}
+	for i, tc := range cases {
+		_, err := decodeCursor(base64.RawURLEncoding.EncodeToString([]byte(tc.data)), scalarSort())
+		var ce *CursorError
+		if !errors.As(err, &ce) || ce.Kind != tc.kind {
+			t.Fatalf("case %d %s: %v", i, tc.data, err)
+		}
+	}
+	for _, token := range []string{"!", "====", base64.RawURLEncoding.EncodeToString([]byte(valid)) + "\n", base64.RawURLEncoding.EncodeToString([]byte("\xff"))} {
+		if _, err := decodeCursor(token, scalarSort()); err == nil {
+			t.Fatalf("accepted %q", token)
+		}
+	}
+	// A well-formed edit is a new seek boundary, not an authentication failure.
+	edited := strings.Replace(valid, `"1"`, `"9007199254740993"`, 1)
+	got, err := decodeCursor(base64.RawURLEncoding.EncodeToString([]byte(edited)), scalarSort())
+	if err != nil || got[0] != int64(9007199254740993) {
+		t.Fatalf("edited boundary: %v %v", got, err)
+	}
+}
+
+func TestCursorSize(t *testing.T) {
+	// Find the exact final-envelope boundary instead of assuming an overhead size.
+	var at string
+	var length int
+	for length = 12000; length < 12400; length++ {
+		token, err := encodeCursor("scalar/v1", []any{strings.Repeat("x", length)})
+		if err == nil && len(token) == maxCursorBytes {
+			at = token
+			break
+		}
+	}
+	if at == "" {
+		t.Fatal("exact boundary not found")
+	}
+	if _, err := decodeCursor(at, scalarSort()); err != nil {
+		t.Fatal(err)
+	}
+	var ce *CursorError
+	if _, err := decodeCursor(at+"A", scalarSort()); !errors.As(err, &ce) || ce.Kind != "size" {
+		t.Fatalf("received limit: %v", err)
+	}
+	p, err := Prepare(scalarSort(), func(v string) []any { return []any{v} }, Request{}, Limits{Default: 1, Maximum: 2})
+	if err != nil {
+		t.Fatal(err)
+	}
+	result, err := p.Page([]string{strings.Repeat("x", length+1)})
+	if !errors.As(err, &ce) || ce.Kind != "size" || !reflect.DeepEqual(result, Page[string]{}) {
+		t.Fatalf("emitted limit: %+v %v", result, err)
+	}
+	if _, err := encodeCursor("scalar/v1", []any{strings.Repeat("x", length-1)}); err != nil {
+		t.Fatal(err)
+	}
+	// Failure in an overflow row also invalidates the entire page.
+	result, err = p.Page([]string{"valid", strings.Repeat("x", length+1)})
+	if !errors.As(err, &ce) || !reflect.DeepEqual(result, Page[string]{}) {
+		t.Fatalf("overflow: %+v %v", result, err)
+	}
+}
+
+func TestPrepareAndKeyValidation(t *testing.T) {
+	limits := Limits{Default: 2, Maximum: 3}
+	badSorts := []Sort{{}, {ID: "x"}, {ID: "x", Columns: []Column{{Unique: true}}}, {ID: "x", Columns: []Column{{Expression: expr.Quote("id"), Direction: Order(2), Unique: true}}}, {ID: "x", Columns: []Column{{Expression: expr.Quote("id")}}}}
+	key := func(v int) []any { return []any{v} }
+	for _, sort := range badSorts {
+		if _, err := Prepare(sort, key, Request{}, limits); err == nil {
+			t.Fatalf("accepted sort: %+v", sort)
+		}
+	}
+	if _, err := Prepare[int](scalarSort(), nil, Request{}, limits); err == nil {
+		t.Fatal("nil key accepted")
+	}
+	for _, l := range []Limits{{}, {Default: 2, Maximum: 1}, {Default: 1, Maximum: math.MaxInt}} {
+		if _, err := Prepare(scalarSort(), key, Request{}, l); err == nil {
+			t.Fatalf("accepted limits %+v", l)
+		}
+	}
+	for _, r := range []Request{{Size: -1}, {Direction: Direction(2)}} {
+		if _, err := Prepare(scalarSort(), key, r, limits); err == nil {
+			t.Fatal("bad request accepted")
+		}
+	}
+	for _, size := range []int{0, 1, 3, 4, math.MaxInt} {
+		p, err := Prepare(scalarSort(), key, Request{Size: size}, limits)
+		want := min(size, 3)
+		if size == 0 {
+			want = 2
+		}
+		if err != nil || p.size != want {
+			t.Fatalf("size %d: %+v %v", size, p, err)
+		}
+	}
+	for _, badLength := range []int{0, 2} {
+		p, err := Prepare(scalarSort(), func(v int) []any {
+			if v == 9 {
+				return make([]any, badLength)
+			}
+			return []any{v}
+		}, Request{Size: 1}, limits)
+		if err != nil {
+			t.Fatal(err)
+		}
+		result, err := p.Page([]int{1, 9})
+		var ke *KeyError
+		if !errors.As(err, &ke) || ke.Expected != 1 || ke.Actual != badLength || !reflect.DeepEqual(result, Page[int]{}) {
+			t.Fatalf("key: %+v %v", result, err)
+		}
+	}
+}

page/example_test.go

@@ -0,0 +1,69 @@
+package page_test
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/stephenafamo/bob"
+	"github.com/stephenafamo/bob/dialect/sqlite"
+	sd "github.com/stephenafamo/bob/dialect/sqlite/dialect"
+	"github.com/stephenafamo/bob/dialect/sqlite/sm"
+	"github.com/stephenafamo/bob/expr"
+	"github.com/stephenafamo/scan"
+	"go.auvem.com/corestack/page"
+)
+
+func Example() {
+	ctx := context.Background()
+	db, err := bob.Open("sqlite3", ":memory:")
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+	db.SetMaxOpenConns(1)
+	if _, err := db.ExecContext(ctx, "CREATE TABLE orders (id BIGINT PRIMARY KEY, priority BIGINT NOT NULL, tenant BIGINT NOT NULL)"); err != nil {
+		panic(err)
+	}
+	if _, err := db.ExecContext(ctx, "INSERT INTO orders VALUES (1,10,7),(2,10,7),(3,5,7),(4,20,8)"); err != nil {
+		panic(err)
+	}
+	type Order struct {
+		ID       int64
+		Priority int64
+	}
+	sort := page.Sort{ID: "orders/priority/v1", Columns: []page.Column{
+		{Expression: expr.Quote("priority"), Direction: page.Desc},
+		{Expression: expr.Quote("id"), Direction: page.Asc, Unique: true},
+	}}
+	// With Bob-generated models, use their column references for these expressions.
+	// The key must independently match their order and actual stored value types.
+	key := func(o Order) []any { return []any{o.Priority, o.ID} }
+	p, err := page.Prepare(sort, key, page.Request{Size: 2}, page.Limits{Default: 2, Maximum: 100})
+	if err != nil {
+		panic(err)
+	}
+	q := sqlite.Select(sm.Columns("id", "priority"), sm.From("orders"), page.Mod[*sd.SelectQuery](p))
+	q.Apply(sm.Where(sqlite.Quote("tenant").EQ(sqlite.Arg(int64(7)))))
+	rows, err := bob.All(ctx, db, q, scan.StructMapper[Order]())
+	if err != nil {
+		panic(err)
+	}
+	result, err := p.Page(rows)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(result.Items, result.HasNext, result.HasPrevious)
+	// Continue with Forward + result.EndCursor, or Backward + result.StartCursor.
+	// A mismatched key returns no partial Page, including for an overflow row.
+	bad, err := page.Prepare(sort, func(o Order) []any { return []any{o.ID} }, page.Request{}, page.Limits{Default: 2, Maximum: 100})
+	if err != nil {
+		panic(err)
+	}
+	_, err = bad.Page(rows)
+	var keyError *page.KeyError
+	fmt.Println(errors.As(err, &keyError), keyError.Expected, keyError.Actual)
+	// Output:
+	// [{1 10} {2 10}] true false
+	// true 2 1
+}

page/page.go

@@ -0,0 +1,184 @@
+// Package page provides transport-neutral keyset pagination for Bob SELECT queries.
+// Callers own authorization, non-null stored sort values, and correspondence between
+// Sort columns and the typed row key. The final column must itself be unique in the
+// selected relation. Mixed directions are supported; null sort values are not.
+//
+// Sort IDs version the expressions, directions, key types and comparison semantics.
+// Cursors expose values and allow edits; they are seek boundaries, not credentials.
+// Concurrent writes or changed filters can skip or repeat rows between requests.
+// Code generation may eventually align Sort and key; handwritten pairs have no
+// compile-time field/type correspondence guarantee.
+//
+// Keys support exactly int, int8, int16, int32, int64, string, time.Time and the
+// standard uuid.UUID. Named types, unsigned values, pointers and null wrappers
+// require explicit caller conversion. Timestamps normalize to UTC with nanosecond
+// precision. Versioned JSON cursors use unpadded base64url, limited to 16,384 bytes
+// after encoding; unsupported values and malformed cursors return typed errors.
+package page
+
+import (
+	"fmt"
+	"slices"
+	"unicode/utf8"
+
+	"github.com/stephenafamo/bob"
+)
+
+// Order is a column's canonical ordering direction.
+type Order uint8
+
+const (
+	// Asc orders smaller values first.
+	Asc Order = iota
+	// Desc orders larger values first.
+	Desc
+)
+
+// Column declares a trusted, non-null SQL expression and its canonical direction.
+// Unique asserts that this column alone is unique, including across joins.
+type Column struct {
+	Expression bob.Expression
+	Direction  Order
+	Unique     bool
+}
+
+// Sort is an immutable, caller-owned ordering contract. Change ID when its
+// expressions, order, key types, uniqueness or comparison semantics change.
+type Sort struct {
+	ID      string
+	Columns []Column
+}
+
+// Direction selects which side of an optional anchor to fetch.
+type Direction uint8
+
+const (
+	// Forward maps to first/after and is the default direction.
+	Forward Direction = iota
+	// Backward maps to last/before; returned items retain canonical sort order.
+	Backward
+)
+
+// Request carries a transport-independent page request. Zero Size uses the
+// configured default; excessive sizes clamp to Maximum. Empty Cursor has no anchor.
+type Request struct {
+	Direction Direction
+	Size      int
+	Cursor    string
+}
+
+// Limits configures page sizes; require 1 <= Default <= Maximum < max int.
+type Limits struct {
+	Default int
+	Maximum int
+}
+
+// KeyError identifies a programmer error in the row key's arity.
+type KeyError struct {
+	Expected int
+	Actual   int
+}
+
+// Error implements error with the expected and actual key lengths.
+func (e *KeyError) Error() string {
+	return fmt.Sprintf("page: key length %d, expected %d", e.Actual, e.Expected)
+}
+
+// Page contains canonical-order items and cursors for their first and last rows.
+// Empty pages have empty cursors. Overflow determines the fetch-direction flag;
+// anchor presence determines the opposite flag, even for empty/stale results.
+// The opposite flag does not prove another row exists.
+type Page[T any] struct {
+	Items       []T
+	StartCursor string
+	EndCursor   string
+	HasNext     bool
+	HasPrevious bool
+}
+
+// Prepared holds validated pagination and the typed row key. Construct with Prepare.
+// Treat Sort expressions and the key's captured state as immutable while in use.
+type Prepared[T any] struct {
+	sort      Sort
+	key       func(T) []any
+	direction Direction
+	size      int
+	anchor    []any
+}
+
+// Prepare validates a request before a Bob mod can be applied. key must return
+// exactly one supported concrete value per Sort column, in the same order, using
+// actual stored/scanned values (including database timestamp precision).
+func Prepare[T any](sort Sort, key func(T) []any, request Request, limits Limits) (*Prepared[T], error) {
+	if sort.ID == "" || !utf8.ValidString(sort.ID) || len(sort.Columns) == 0 {
+		return nil, fmt.Errorf("page: sort needs a valid ID and columns")
+	}
+	for i, c := range sort.Columns {
+		if c.Expression == nil || c.Direction > Desc {
+			return nil, fmt.Errorf("page: invalid sort column %d", i)
+		}
+	}
+	if !sort.Columns[len(sort.Columns)-1].Unique {
+		return nil, fmt.Errorf("page: final sort column must be unique")
+	}
+	if key == nil {
+		return nil, fmt.Errorf("page: nil key function")
+	}
+	if limits.Default < 1 || limits.Maximum < limits.Default || limits.Maximum == int(^uint(0)>>1) {
+		return nil, fmt.Errorf("page: invalid limits")
+	}
+	if request.Direction > Backward || request.Size < 0 {
+		return nil, fmt.Errorf("page: invalid request direction or size")
+	}
+	size := request.Size
+	if size == 0 {
+		size = limits.Default
+	}
+	size = min(size, limits.Maximum)
+	sort.Columns = slices.Clone(sort.Columns)
+	p := &Prepared[T]{sort: sort, key: key, direction: request.Direction, size: size}
+	if request.Cursor != "" {
+		var err error
+		p.anchor, err = decodeCursor(request.Cursor, sort)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return p, nil
+}
+
+// Page validates all fetched rows, including overflow, and assembles a page.
+// Pass rows in query order, with at most size+1 rows. It copies retained items;
+// backward pagination never reverses the caller's slice. Errors return no page.
+func (p *Prepared[T]) Page(rows []T) (Page[T], error) {
+	var zero Page[T]
+	if len(rows) > p.size+1 {
+		return zero, fmt.Errorf("page: too many fetched rows")
+	}
+	cursors := make([]string, len(rows))
+	for i, row := range rows {
+		key := p.key(row)
+		if len(key) != len(p.sort.Columns) {
+			return zero, &KeyError{Expected: len(p.sort.Columns), Actual: len(key)}
+		}
+		var err error
+		cursors[i], err = encodeCursor(p.sort.ID, key)
+		if err != nil {
+			return zero, err
+		}
+	}
+	overflow := len(rows) > p.size
+	n := min(len(rows), p.size)
+	result := Page[T]{Items: slices.Clone(rows[:n])}
+	if n > 0 {
+		result.StartCursor, result.EndCursor = cursors[0], cursors[n-1]
+	}
+	if p.direction == Backward {
+		slices.Reverse(result.Items)
+		result.StartCursor, result.EndCursor = result.EndCursor, result.StartCursor
+		result.HasPrevious, result.HasNext = overflow, len(p.anchor) > 0
+	} else {
+		result.HasNext, result.HasPrevious = overflow, len(p.anchor) > 0
+	}
+	return result, nil
+}

page/query.go

@@ -0,0 +1,68 @@
+package page
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stephenafamo/bob"
+	"github.com/stephenafamo/bob/clause"
+	"github.com/stephenafamo/bob/expr"
+	"github.com/stephenafamo/scan"
+)
+
+// Mod applies validated keyset WHERE, ORDER BY and integer LIMIT size+1 to native
+// PostgreSQL, SQLite or MySQL selects. Apply once to a query with no existing
+// ORDER BY, LIMIT, OFFSET or FETCH; do not override pagination afterward.
+// Callers may compose additional WHERE filters before or after this mod.
+func Mod[Q interface {
+	AppendWhere(...any)
+	AppendOrder(bob.Expression)
+	SetLimit(any)
+}, T any](p *Prepared[T]) bob.Mod[Q] {
+	return bob.ModFunc[Q](func(q Q) {
+		var alternatives []bob.Expression
+		for i, c := range p.sort.Columns {
+			desc := c.Direction == Desc
+			if p.direction == Backward {
+				desc = !desc
+			}
+			direction, operator := "ASC", ">"
+			if desc {
+				direction, operator = "DESC", "<"
+			}
+			q.AppendOrder(clause.OrderDef{Expression: c.Expression, Direction: direction})
+			if len(p.anchor) == 0 {
+				continue
+			}
+			terms := make([]bob.Expression, 0, i+1)
+			for j := 0; j < i; j++ {
+				terms = append(terms, expr.OP("=", p.sort.Columns[j].Expression, expr.Arg(p.anchor[j])))
+			}
+			terms = append(terms, expr.OP(operator, c.Expression, expr.Arg(p.anchor[i])))
+			alternatives = append(alternatives, grouped(terms, " AND "))
+		}
+		// authz: group the seek disjunction so caller filters constrain every branch.
+		if len(alternatives) > 0 {
+			q.AppendWhere(grouped(alternatives, " OR "))
+		}
+		q.SetLimit(p.size + 1)
+	})
+}
+
+func grouped(expressions []bob.Expression, separator string) bob.Expression {
+	return expr.Join{Exprs: []bob.Expression{
+		expr.Raw("("), expr.Join{Exprs: expressions, Sep: separator}, expr.Raw(")"),
+	}, Sep: expr.NoSep}
+}
+
+// Count executes a separate caller-built, authorized count query returning one
+// int64 column. It never rewrites a paginated query or infers grouped/distinct
+// semantics. Nothing runs unless called.
+func Count(ctx context.Context, executor bob.Executor, query bob.Query) (int64, error) {
+	// authz: callers supply the same authorized relation as their item query.
+	count, err := bob.One(ctx, executor, query, scan.SingleColumnMapper[int64])
+	if err != nil {
+		return 0, fmt.Errorf("page: count: %w", err)
+	}
+	return count, nil
+}

page/query_test.go

@@ -0,0 +1,189 @@
+package page_test
+
+import (
+	"database/sql"
+	"os"
+	"reflect"
+
+	"errors"
+	"testing"
+
+	_ "github.com/lib/pq"
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/stephenafamo/bob"
+	"github.com/stephenafamo/bob/dialect/mysql"
+	md "github.com/stephenafamo/bob/dialect/mysql/dialect"
+	mm "github.com/stephenafamo/bob/dialect/mysql/sm"
+	"github.com/stephenafamo/bob/dialect/psql"
+	pd "github.com/stephenafamo/bob/dialect/psql/dialect"
+	pm "github.com/stephenafamo/bob/dialect/psql/sm"
+	"github.com/stephenafamo/bob/dialect/sqlite"
+	sd "github.com/stephenafamo/bob/dialect/sqlite/dialect"
+	"github.com/stephenafamo/bob/dialect/sqlite/sm"
+	"github.com/stephenafamo/bob/expr"
+	"github.com/stephenafamo/scan"
+	"go.auvem.com/corestack/page"
+)
+
+type item struct {
+	ID    int64
+	Score int64
+}
+
+func itemSort() page.Sort {
+	return page.Sort{ID: "items/score/v1", Columns: []page.Column{
+		{Expression: expr.Quote("score"), Direction: page.Desc},
+		{Expression: expr.Quote("id"), Direction: page.Asc, Unique: true},
+	}}
+}
+
+func itemKey(i item) []any { return []any{i.Score, i.ID} }
+
+func TestSQLiteFlow(t *testing.T) {
+	db, err := bob.Open("sqlite3", ":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	databaseFlow(t, db, false)
+}
+
+func TestPostgresFlow(t *testing.T) {
+	dsn := os.Getenv("PAGE_POSTGRES_DSN")
+	if dsn == "" {
+		if os.Getenv("PAGE_REQUIRE_POSTGRES") != "" {
+			t.Fatal("PAGE_POSTGRES_DSN is required")
+		}
+		t.Skip("set PAGE_POSTGRES_DSN to run PostgreSQL integration")
+	}
+	db, err := bob.Open("postgres", dsn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	databaseFlow(t, db, true)
+}
+
+func databaseFlow(t *testing.T, db bob.DB, postgres bool) {
+	t.Helper()
+	db.SetMaxOpenConns(1)
+	for _, statement := range []string{
+		"CREATE TEMP TABLE items (id BIGINT PRIMARY KEY, score BIGINT NOT NULL, tenant BIGINT NOT NULL)",
+		"INSERT INTO items VALUES (1,30,1),(2,30,1),(3,20,1),(4,10,1),(5,5,2),(6,30,2)",
+	} {
+		if _, err := db.ExecContext(t.Context(), statement); err != nil {
+			t.Fatal(err)
+		}
+	}
+	fetch := func(direction page.Direction, size int, cursor string) page.Page[item] {
+		t.Helper()
+		p, err := page.Prepare(itemSort(), itemKey, page.Request{Direction: direction, Size: size, Cursor: cursor}, page.Limits{Default: 2, Maximum: 3})
+		if err != nil {
+			t.Fatal(err)
+		}
+		var q bob.Query
+		if postgres {
+			query := psql.Select(pm.Columns("id", "score"), pm.From("items"), pm.Where(psql.Quote("tenant").EQ(psql.Arg(int64(1)))))
+			query.Apply(page.Mod[*pd.SelectQuery](p))
+			query.Apply(pm.Where(psql.Quote("score").GT(psql.Arg(int64(0)))))
+			q = query
+		} else {
+			query := sqlite.Select(sm.Columns("id", "score"), sm.From("items"), sm.Where(sqlite.Quote("tenant").EQ(sqlite.Arg(int64(1)))))
+			query.Apply(page.Mod[*sd.SelectQuery](p))
+			query.Apply(sm.Where(sqlite.Quote("score").GT(sqlite.Arg(int64(0)))))
+			q = query
+		}
+		rows, err := bob.All(t.Context(), db, q, scan.StructMapper[item]())
+		if err != nil {
+			t.Fatal(err)
+		}
+		before := append([]item(nil), rows...)
+		result, err := p.Page(rows)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !reflect.DeepEqual(before, rows) {
+			t.Fatal("Page mutated fetched slice")
+		}
+		return result
+	}
+	check := func(got page.Page[item], ids []int64, next, previous bool) {
+		t.Helper()
+		actual := make([]int64, len(got.Items))
+		for i, row := range got.Items {
+			actual[i] = row.ID
+		}
+		if !reflect.DeepEqual(actual, ids) || got.HasNext != next || got.HasPrevious != previous {
+			t.Fatalf("got IDs %v next=%v previous=%v; want %v %v %v", actual, got.HasNext, got.HasPrevious, ids, next, previous)
+		}
+		if len(ids) == 0 && (got.StartCursor != "" || got.EndCursor != "") {
+			t.Fatal("empty page has cursors")
+		}
+		if len(ids) > 0 && (got.StartCursor == "" || got.EndCursor == "") {
+			t.Fatal("missing cursors")
+		}
+	}
+	first := fetch(page.Forward, 2, "")
+	check(first, []int64{1, 2}, true, false)
+	second := fetch(page.Forward, 2, first.EndCursor)
+	check(second, []int64{3, 4}, false, true)
+	check(fetch(page.Forward, 2, second.EndCursor), []int64{}, false, true)
+	last := fetch(page.Backward, 2, "")
+	check(last, []int64{3, 4}, false, true)
+	previous := fetch(page.Backward, 2, last.StartCursor)
+	check(previous, []int64{1, 2}, true, false)
+	check(fetch(page.Backward, 2, previous.StartCursor), []int64{}, true, false)
+	check(fetch(page.Forward, 0, ""), []int64{1, 2}, true, false)
+	check(fetch(page.Forward, 1000, ""), []int64{1, 2, 3}, true, false)
+	// A cursor describes a value boundary even after its row is deleted.
+	if _, err := db.ExecContext(t.Context(), "DELETE FROM items WHERE id=2"); err != nil {
+		t.Fatal(err)
+	}
+	check(fetch(page.Forward, 2, first.EndCursor), []int64{3, 4}, false, true)
+	var countQuery, emptyQuery bob.Query
+	if postgres {
+		countQuery = psql.Select(pm.Columns("count(*)"), pm.From("items"), pm.Where(psql.Quote("tenant").EQ(psql.Arg(1))))
+		emptyQuery = psql.Select(pm.Columns("id"), pm.From("items"), pm.Where(psql.Quote("id").LT(psql.Arg(0))))
+	} else {
+		countQuery = sqlite.Select(sm.Columns("count(*)"), sm.From("items"), sm.Where(sqlite.Quote("tenant").EQ(sqlite.Arg(1))))
+		emptyQuery = sqlite.Select(sm.Columns("id"), sm.From("items"), sm.Where(sqlite.Quote("id").LT(sqlite.Arg(0))))
+	}
+	count, err := page.Count(t.Context(), db, countQuery)
+	if err != nil || count != 3 {
+		t.Fatalf("count %d: %v", count, err)
+	}
+	if _, err := page.Count(t.Context(), db, emptyQuery); !errors.Is(err, sql.ErrNoRows) {
+		t.Fatalf("count error lost cause: %v", err)
+	}
+	_, err = page.Prepare(itemSort(), itemKey, page.Request{Cursor: "not!base64"}, page.Limits{Default: 2, Maximum: 3})
+	var cursorError *page.CursorError
+	if !errors.As(err, &cursorError) {
+		t.Fatalf("invalid cursor: %v", err)
+	}
+	bad, err := page.Prepare(itemSort(), func(item) []any { return []any{int64(1)} }, page.Request{}, page.Limits{Default: 2, Maximum: 3})
+	if err != nil {
+		t.Fatal(err)
+	}
+	result, err := bad.Page([]item{{ID: 1}})
+	var keyError *page.KeyError
+	if !errors.As(err, &keyError) || !reflect.DeepEqual(result, page.Page[item]{}) {
+		t.Fatalf("key failure: %+v %v", result, err)
+	}
+	if _, err := db.ExecContext(t.Context(), "DELETE FROM items"); err != nil {
+		t.Fatal(err)
+	}
+	check(fetch(page.Forward, 2, ""), []int64{}, false, false)
+	check(fetch(page.Backward, 2, ""), []int64{}, false, false)
+	check(fetch(page.Forward, 2, first.EndCursor), []int64{}, false, true)
+	check(fetch(page.Backward, 2, last.StartCursor), []int64{}, true, false)
+}
+
+func TestMySQLModComposition(t *testing.T) {
+	p, err := page.Prepare(itemSort(), itemKey, page.Request{}, page.Limits{Default: 2, Maximum: 3})
+	if err != nil {
+		t.Fatal(err)
+	}
+	q := mysql.Select(mm.Columns("id", "score"), mm.From("items"), page.Mod[*md.SelectQuery](p))
+	q.Apply(mm.Where(mysql.Quote("tenant").EQ(mysql.Arg(int64(1)))))
+	// Compile-time composition only; MySQL runtime behavior needs a database test.
+}