Drop temporary_table_exists patch — Turso deadlocks during run, not shutdown

Re-running with the patch on showed it's not a shutdown-only hang:
PHPUnit makes it to ~test 504/667 and then tests stop advancing. The
Turso deadlock is triggered by driver code paths the patch opens up,
and can't be undone from the PHP side. Keep only wp_die polyfill and
the PHPUnit timeout wrapper (still useful as a safety net).

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -428,39 +428,25 @@ jobs:
         working-directory: packages/mysql-on-sqlite
         run: |
           python3 - <<'PY'
-          # 1. Turso doesn't expose `sqlite_temp_master`. The driver queries it
-          #    to decide whether to use temp-schema tables, but Turso doesn't
-          #    support TEMP tables at all, so the predicate is always false.
-          path = 'src/sqlite/class-wp-sqlite-information-schema-builder.php'
-          src = open(path).read()
-          old = (
-              "\tpublic function temporary_table_exists( string $table_name ): bool {\n"
-              "\t\t/*\n"
-              "\t\t * We could search in the \"{$this->temporary_table_prefix}tables\" table,\n"
-              "\t\t * but it may not exist yet, so using \"sqlite_temp_master\" is simpler.\n"
-              "\t\t */\n"
-              "\t\t$stmt = $this->connection->query(\n"
-              "\t\t\t\"SELECT 1 FROM sqlite_temp_master WHERE type = 'table' AND name = ?\",\n"
-              "\t\t\tarray( $table_name )\n"
-              "\t\t);\n"
-              "\t\treturn $stmt->fetchColumn() === '1';\n"
-              "\t}"
-          )
-          new = (
-              "\tpublic function temporary_table_exists( string $table_name ): bool {\n"
-              "\t\t// Turso compatibility: it does not support TEMP tables or\n"
-              "\t\t// expose sqlite_temp_master, so this is always false.\n"
-              "\t\treturn false;\n"
-              "\t}"
-          )
-          assert old in src, 'temporary_table_exists body not found'
-          src = src.replace(old, new, 1)
-          open(path, 'w').write(src)
-          print('patched information-schema-builder.php (temporary_table_exists)')
-
-          # 2. wp_die polyfill: real WordPress provides wp_die(); the unit-test
-          #    bootstrap doesn't, so 21 tests hit an 'undefined function' error
-          #    when a driver error path tries to call it.
+          # Driver patches ATTEMPTED and abandoned:
+          #
+          # - temporary_table_exists → false: would save ~250 errors from
+          #   'no such table: sqlite_temp_master', but changing the predicate's
+          #   return value makes the driver take code paths that deadlock inside
+          #   Turso's sqlite3_finalize during subsequent tests (gdb traces show
+          #   a mutex on sqlite3Inner held across the step->finalize cycle).
+          #   Requires a Turso fix.
+          #
+          # - sync_column_key_info row-value UPDATE rewrite: valid SQL, but
+          #   triggers a pathological case in Turso's query planner that hangs
+          #   PHPUnit somewhere after test 504/667.
+          #
+          # Only the wp_die polyfill is safe; it doesn't change driver/query
+          # behaviour.
+
+          # wp_die polyfill: real WordPress provides wp_die(); the unit-test
+          # bootstrap doesn't, so 21 tests hit an 'undefined function' error
+          # when a driver error path tries to call it.
           path = 'tests/bootstrap.php'
           src = open(path).read()
           marker = "if ( ! function_exists( 'do_action' ) ) {"