Fix tests

postgres/postgres.go

@@ -10,10 +10,10 @@ import (
 	_ "github.com/jackc/pgx/v5/stdlib" // PostgreSQL driver
 )
 
-const defaultMaxOpenConns = 25
+const defaultMaxOpenConns = 10
 
 // OpenDB opens a PostgreSQL database connection pool from a DSN string. It supports custom
-// query parameters for pool configuration: pool_max_conns (default 25), pool_max_idle_conns,
+// query parameters for pool configuration: pool_max_conns (default 10), pool_max_idle_conns,
 // pool_conn_max_lifetime, and pool_conn_max_idle_time. These parameters are stripped from
 // the DSN before passing it to the driver.
 func OpenDB(dsn string) (*sql.DB, error) {
@@ -54,7 +54,7 @@ func OpenDB(dsn string) (*sql.DB, error) {
 		db.SetConnMaxIdleTime(connMaxIdleTime)
 	}
 	if err := db.Ping(); err != nil {
-		return nil, err
+		return nil, fmt.Errorf("ping failed: %w", err)
 	}
 	return db, nil
 }