fix: harden module lifecycle and debug log setup

Export CurrentDialect(), return setup errors when debug logger is not
registered, and guard DestName logging when the module is uninitialized.

Co-authored-by: Cursor <cursoragent@cursor.com>

dest.go

@@ -20,14 +20,14 @@ func DestName(destTypeStruct any, path ...string) string {
 
 	for i, p := range path {
 		if v.Kind() != reflect.Struct {
-			dbxshared.DBModule.Logger().Error("DestName: path parent is not a struct", "path", destIdent+"."+strings.Join(path[:i+1], "."))
+			destNameLogError("DestName: path parent is not a struct", destIdent+"."+strings.Join(path[:i+1], "."))
 			return ""
 		}
 
 		v = v.FieldByName(p)
 
 		if !v.IsValid() {
-			dbxshared.DBModule.Logger().Error("DestName: field does not exist", "path", destIdent+"."+strings.Join(path[:i+1], "."))
+			destNameLogError("DestName: field does not exist", destIdent+"."+strings.Join(path[:i+1], "."))
 			return ""
 		}
 
@@ -36,3 +36,10 @@ func DestName(destTypeStruct any, path ...string) string {
 
 	return destIdent
 }
+
+func destNameLogError(msg, path string) {
+	if dbxshared.DBModule == nil {
+		return
+	}
+	dbxshared.DBModule.Logger().Error(msg, "path", path)
+}