fix: set UTF8 client encoding for schema init

@@ -19,10 +19,9 @@ def main() -> None:
 
     psycopg = _import_psycopg()
     schema_sql = Path(args.schema).read_text(encoding="utf-8")
-    with psycopg.connect(args.dsn) as conn:
-        with conn.cursor() as cursor:
-            cursor.execute(schema_sql)
-        conn.commit()
+    with psycopg.connect(args.dsn, autocommit=True) as conn:
+        conn.execute("SET client_encoding = 'UTF8'")
+        conn.execute(schema_sql)
     print(f"initialized schema from {args.schema}")