[ci skip] codex 5.3 review

db/db.go

@@ -5,6 +5,7 @@ import (
 	"embed"
 	"fmt"
 	"log/slog"
+	"os"
 	"reflect"
 	"strings"
 
@@ -40,6 +41,10 @@ func New(logger *slog.Logger, cfg Config) (Database, error) {
 		}
 		return db, nil
 	case "postgres":
+		// The sqlc query set is SQLite-first. Keep Postgres opt-in until full parity is validated.
+		if strings.TrimSpace(os.Getenv("VCTP_ENABLE_EXPERIMENTAL_POSTGRES")) != "1" {
+			return nil, fmt.Errorf("postgres driver is disabled by default; set VCTP_ENABLE_EXPERIMENTAL_POSTGRES=1 to enable experimental mode")
+		}
 		db, err := newPostgresDB(logger, cfg.DSN)
 		if err != nil {
 			return nil, err