feat: add Go password session lifecycle

backend/internal/postgres/open.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"strconv"
 
+	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
@@ -68,8 +69,40 @@ func (p *pgxPoolAdapter) Query(ctx context.Context, sql string, args ...any) (Ro
 	return p.pool.Query(ctx, sql, args...)
 }
 
+func (p *pgxPoolAdapter) Begin(ctx context.Context) (Transaction, error) {
+	tx, err := p.pool.Begin(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &pgxTransactionAdapter{tx: tx}, nil
+}
+
 func (p *pgxPoolAdapter) Close() {
 	p.pool.Close()
 }
 
 var _ Pool = (*pgxPoolAdapter)(nil)
+var _ TransactionBeginner = (*pgxPoolAdapter)(nil)
+
+type pgxTransactionAdapter struct {
+	tx pgx.Tx
+}
+
+func (t *pgxTransactionAdapter) Query(ctx context.Context, sql string, args ...any) (Rows, error) {
+	return t.tx.Query(ctx, sql, args...)
+}
+
+func (t *pgxTransactionAdapter) Exec(ctx context.Context, sql string, args ...any) error {
+	_, err := t.tx.Exec(ctx, sql, args...)
+	return err
+}
+
+func (t *pgxTransactionAdapter) Commit(ctx context.Context) error {
+	return t.tx.Commit(ctx)
+}
+
+func (t *pgxTransactionAdapter) Rollback(ctx context.Context) error {
+	return t.tx.Rollback(ctx)
+}
+
+var _ Transaction = (*pgxTransactionAdapter)(nil)