sync: migrate ai-operator to Gitea (2026-08-10)

internal/db/migrations.go

@@ -0,0 +1,71 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type MigrationResult struct {
+	Applied []string
+	Skipped []string
+}
+
+func ApplyMigrations(ctx context.Context, pool *pgxpool.Pool, files map[string]string) (MigrationResult, error) {
+	if _, err := pool.Exec(ctx, `CREATE TABLE IF NOT EXISTS schema_migrations (version text PRIMARY KEY, applied_at timestamptz NOT NULL DEFAULT now())`); err != nil {
+		return MigrationResult{}, err
+	}
+	versions := make([]string, 0, len(files))
+	for v := range files {
+		versions = append(versions, v)
+	}
+	sort.Strings(versions)
+	res := MigrationResult{}
+	for _, version := range versions {
+		var exists bool
+		if err := pool.QueryRow(ctx, `SELECT EXISTS (SELECT 1 FROM schema_migrations WHERE version=$1)`, version).Scan(&exists); err != nil {
+			return res, err
+		}
+		if exists {
+			res.Skipped = append(res.Skipped, version)
+			continue
+		}
+		tx, err := pool.Begin(ctx)
+		if err != nil {
+			return res, err
+		}
+		if _, err = tx.Exec(ctx, files[version]); err != nil {
+			_ = tx.Rollback(ctx)
+			return res, fmt.Errorf("apply migration %s: %w", version, err)
+		}
+		if _, err = tx.Exec(ctx, `INSERT INTO schema_migrations(version) VALUES($1)`, version); err != nil {
+			_ = tx.Rollback(ctx)
+			return res, err
+		}
+		if err = tx.Commit(ctx); err != nil {
+			return res, err
+		}
+		res.Applied = append(res.Applied, version)
+	}
+	return res, nil
+}
+
+func LoadMigrationFiles(paths []string, read func(string) ([]byte, error)) (map[string]string, error) {
+	out := map[string]string{}
+	for _, p := range paths {
+		b, err := read(p)
+		if err != nil {
+			return nil, err
+		}
+		name := filepath.Base(p)
+		if !strings.HasSuffix(name, ".sql") {
+			continue
+		}
+		out[name] = string(b)
+	}
+	return out, nil
+}