Revert "Clear stale FUNC_SLOTS on sqlite3_close"

This reverts commit a39d432.

Author: JanJakes

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

@@ -595,54 +595,6 @@ jobs:
           print('patched CreateTrigger to preserve original SQL text')
           PY_TRIGGER_SQL
 
-          # Clear stale FUNC_SLOTS on sqlite3_close. Existing patches keep
-          # slots populated across PDO close (avoiding p_app UAF during
-          # PHP GC), but leftover stale `db` pointers persist process-wide
-          # and may explain mid-suite state-dependent failures (the
-          # 3 remaining tests pass in fresh-PDO probes).
-          python3 - <<'PY_CLOSE_SLOTS'
-          p = 'sqlite3/src/lib.rs'
-          s = open(p).read()
-          old = (
-              "#[no_mangle]\n"
-              "pub unsafe extern \"C\" fn sqlite3_close(db: *mut sqlite3) -> ffi::c_int {\n"
-              "    trace!(\"sqlite3_close\");\n"
-              "    if db.is_null() {\n"
-              "        return SQLITE_OK;\n"
-              "    }\n"
-              "    let _ = Box::from_raw(db);\n"
-              "    SQLITE_OK\n"
-              "}\n"
-          )
-          new = (
-              "#[no_mangle]\n"
-              "pub unsafe extern \"C\" fn sqlite3_close(db: *mut sqlite3) -> ffi::c_int {\n"
-              "    trace!(\"sqlite3_close\");\n"
-              "    if db.is_null() {\n"
-              "        return SQLITE_OK;\n"
-              "    }\n"
-              "    // Clear any FUNC_SLOTS that still reference this db so the\n"
-              "    // process-global table doesn't accumulate stale entries.\n"
-              "    {\n"
-              "        let db_addr = db as usize;\n"
-              "        let mut slots = func_slots().lock().unwrap();\n"
-              "        for slot in slots.iter_mut() {\n"
-              "            if let Some(s) = slot.as_ref() {\n"
-              "                if s.db == db_addr {\n"
-              "                    *slot = None;\n"
-              "                }\n"
-              "            }\n"
-              "        }\n"
-              "    }\n"
-              "    let _ = Box::from_raw(db);\n"
-              "    SQLITE_OK\n"
-              "}\n"
-          )
-          assert old in s, 'sqlite3_close block not found'
-          open(p, 'w').write(s.replace(old, new, 1))
-          print('patched sqlite3_close to clear stale FUNC_SLOTS for closing db')
-          PY_CLOSE_SLOTS
-
           echo '--- Patched stub! macro ---'
           sed -n '/macro_rules! stub/,/^}$/p' sqlite3/src/lib.rs