diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3654066f..fa077365 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,7 +10,7 @@ repos:
     -   id: name-tests-test
     -   id: requirements-txt-fixer
 -   repo: https://github.com/asottile/setup-cfg-fmt
-    rev: v3.2.0
+    rev: v3.1.0
     hooks:
     -   id: setup-cfg-fmt
 -   repo: https://github.com/asottile/reorder-python-imports
@@ -24,7 +24,7 @@ repos:
     hooks:
     -   id: add-trailing-comma
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v3.21.2
+    rev: v3.21.0
     hooks:
     -   id: pyupgrade
         args: [--py310-plus]
@@ -37,7 +37,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.1
+    rev: v1.18.2
     hooks:
     -   id: mypy
         additional_dependencies: [types-pyyaml]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 879ae073..b27af5e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,17 +1,3 @@
-4.5.1 - 2025-12-16
-==================
-
-### Fixes
-- Fix `language: python` with `repo: local` without `additional_dependencies`.
-    - #3597 PR by @asottile.
-
-4.5.0 - 2025-11-22
-==================
-
-### Features
-- Add `pre-commit hazmat`.
-    - #3585 PR by @asottile.
-
 4.4.0 - 2025-11-08
 ==================
 
diff --git a/pre_commit/clientlib.py b/pre_commit/clientlib.py
index 51f14d26..eb0fd4d6 100644
--- a/pre_commit/clientlib.py
+++ b/pre_commit/clientlib.py
@@ -270,19 +270,10 @@ class InvalidManifestError(FatalError):
     pass
 
 
-def _load_manifest_forward_compat(contents: str) -> object:
-    obj = yaml_load(contents)
-    if isinstance(obj, dict):
-        check_min_version('5')
-        raise AssertionError('unreachable')
-    else:
-        return obj
-
-
 load_manifest = functools.partial(
     cfgv.load_from_filename,
     schema=MANIFEST_SCHEMA,
-    load_strategy=_load_manifest_forward_compat,
+    load_strategy=yaml_load,
     exc_tp=InvalidManifestError,
 )
 
diff --git a/pre_commit/commands/gc.py b/pre_commit/commands/gc.py
index 975d5e4c..6892e097 100644
--- a/pre_commit/commands/gc.py
+++ b/pre_commit/commands/gc.py
@@ -12,7 +12,6 @@ from pre_commit.clientlib import load_manifest
 from pre_commit.clientlib import LOCAL
 from pre_commit.clientlib import META
 from pre_commit.store import Store
-from pre_commit.util import rmtree
 
 
 def _mark_used_repos(
@@ -27,8 +26,7 @@ def _mark_used_repos(
         for hook in repo['hooks']:
             deps = hook.get('additional_dependencies')
             unused_repos.discard((
-                store.db_repo_name(repo['repo'], deps),
-                C.LOCAL_REPO_VERSION,
+                store.db_repo_name(repo['repo'], deps), C.LOCAL_REPO_VERSION,
             ))
     else:
         key = (repo['repo'], repo['rev'])
@@ -58,41 +56,34 @@ def _mark_used_repos(
             ))
 
 
-def _gc(store: Store) -> int:
-    with store.exclusive_lock(), store.connect() as db:
-        store._create_configs_table(db)
+def _gc_repos(store: Store) -> int:
+    configs = store.select_all_configs()
+    repos = store.select_all_repos()
 
-        repos = db.execute('SELECT repo, ref, path FROM repos').fetchall()
-        all_repos = {(repo, ref): path for repo, ref, path in repos}
-        unused_repos = set(all_repos)
+    # delete config paths which do not exist
+    dead_configs = [p for p in configs if not os.path.exists(p)]
+    live_configs = [p for p in configs if os.path.exists(p)]
 
-        configs_rows = db.execute('SELECT path FROM configs').fetchall()
-        configs = [path for path, in configs_rows]
+    all_repos = {(repo, ref): path for repo, ref, path in repos}
+    unused_repos = set(all_repos)
+    for config_path in live_configs:
+        try:
+            config = load_config(config_path)
+        except InvalidConfigError:
+            dead_configs.append(config_path)
+            continue
+        else:
+            for repo in config['repos']:
+                _mark_used_repos(store, all_repos, unused_repos, repo)
 
-        dead_configs = []
-        for config_path in configs:
-            try:
-                config = load_config(config_path)
-            except InvalidConfigError:
-                dead_configs.append(config_path)
-                continue
-            else:
-                for repo in config['repos']:
-                    _mark_used_repos(store, all_repos, unused_repos, repo)
-
-        paths = [(path,) for path in dead_configs]
-        db.executemany('DELETE FROM configs WHERE path = ?', paths)
-
-        db.executemany(
-            'DELETE FROM repos WHERE repo = ? and ref = ?',
-            sorted(unused_repos),
-        )
-        for k in unused_repos:
-            rmtree(all_repos[k])
-
-        return len(unused_repos)
+    store.delete_configs(dead_configs)
+    for db_repo_name, ref in unused_repos:
+        store.delete_repo(db_repo_name, ref, all_repos[(db_repo_name, ref)])
+    return len(unused_repos)
 
 
 def gc(store: Store) -> int:
-    output.write_line(f'{_gc(store)} repo(s) removed.')
+    with store.exclusive_lock():
+        repos_removed = _gc_repos(store)
+    output.write_line(f'{repos_removed} repo(s) removed.')
     return 0
diff --git a/pre_commit/commands/hazmat.py b/pre_commit/commands/hazmat.py
deleted file mode 100644
index 01b27ce6..00000000
--- a/pre_commit/commands/hazmat.py
+++ /dev/null
@@ -1,95 +0,0 @@
-from __future__ import annotations
-
-import argparse
-import subprocess
-from collections.abc import Sequence
-
-from pre_commit.parse_shebang import normalize_cmd
-
-
-def add_parsers(parser: argparse.ArgumentParser) -> None:
-    subparsers = parser.add_subparsers(dest='tool')
-
-    cd_parser = subparsers.add_parser(
-        'cd', help='cd to a subdir and run the command',
-    )
-    cd_parser.add_argument('subdir')
-    cd_parser.add_argument('cmd', nargs=argparse.REMAINDER)
-
-    ignore_exit_code_parser = subparsers.add_parser(
-        'ignore-exit-code', help='run the command but ignore the exit code',
-    )
-    ignore_exit_code_parser.add_argument('cmd', nargs=argparse.REMAINDER)
-
-    n1_parser = subparsers.add_parser(
-        'n1', help='run the command once per filename',
-    )
-    n1_parser.add_argument('cmd', nargs=argparse.REMAINDER)
-
-
-def _cmd_filenames(cmd: tuple[str, ...]) -> tuple[
-    tuple[str, ...],
-    tuple[str, ...],
-]:
-    for idx, val in enumerate(reversed(cmd)):
-        if val == '--':
-            split = len(cmd) - idx
-            break
-    else:
-        raise SystemExit('hazmat entry must end with `--`')
-
-    return cmd[:split - 1], cmd[split:]
-
-
-def cd(subdir: str, cmd: tuple[str, ...]) -> int:
-    cmd, filenames = _cmd_filenames(cmd)
-
-    prefix = f'{subdir}/'
-    new_filenames = []
-    for filename in filenames:
-        if not filename.startswith(prefix):
-            raise SystemExit(f'unexpected file without {prefix=}: {filename}')
-        else:
-            new_filenames.append(filename.removeprefix(prefix))
-
-    cmd = normalize_cmd(cmd)
-    return subprocess.call((*cmd, *new_filenames), cwd=subdir)
-
-
-def ignore_exit_code(cmd: tuple[str, ...]) -> int:
-    cmd = normalize_cmd(cmd)
-    subprocess.call(cmd)
-    return 0
-
-
-def n1(cmd: tuple[str, ...]) -> int:
-    cmd, filenames = _cmd_filenames(cmd)
-    cmd = normalize_cmd(cmd)
-    ret = 0
-    for filename in filenames:
-        ret |= subprocess.call((*cmd, filename))
-    return ret
-
-
-def impl(args: argparse.Namespace) -> int:
-    args.cmd = tuple(args.cmd)
-    if args.tool == 'cd':
-        return cd(args.subdir, args.cmd)
-    elif args.tool == 'ignore-exit-code':
-        return ignore_exit_code(args.cmd)
-    elif args.tool == 'n1':
-        return n1(args.cmd)
-    else:
-        raise NotImplementedError(f'unexpected tool: {args.tool}')
-
-
-def main(argv: Sequence[str] | None = None) -> int:
-    parser = argparse.ArgumentParser()
-    add_parsers(parser)
-    args = parser.parse_args(argv)
-
-    return impl(args)
-
-
-if __name__ == '__main__':
-    raise SystemExit(main())
diff --git a/pre_commit/lang_base.py b/pre_commit/lang_base.py
index 198e9365..95be7b9b 100644
--- a/pre_commit/lang_base.py
+++ b/pre_commit/lang_base.py
@@ -5,7 +5,6 @@ import os
 import random
 import re
 import shlex
-import sys
 from collections.abc import Generator
 from collections.abc import Sequence
 from typing import Any
@@ -172,10 +171,7 @@ def run_xargs(
 
 
 def hook_cmd(entry: str, args: Sequence[str]) -> tuple[str, ...]:
-    cmd = shlex.split(entry)
-    if cmd[:2] == ['pre-commit', 'hazmat']:
-        cmd = [sys.executable, '-m', 'pre_commit.commands.hazmat', *cmd[2:]]
-    return (*cmd, *args)
+    return (*shlex.split(entry), *args)
 
 
 def basic_run_hook(
diff --git a/pre_commit/main.py b/pre_commit/main.py
index 0c3eefda..c33fbfda 100644
--- a/pre_commit/main.py
+++ b/pre_commit/main.py
@@ -10,7 +10,6 @@ import pre_commit.constants as C
 from pre_commit import clientlib
 from pre_commit import git
 from pre_commit.color import add_color_option
-from pre_commit.commands import hazmat
 from pre_commit.commands.autoupdate import autoupdate
 from pre_commit.commands.clean import clean
 from pre_commit.commands.gc import gc
@@ -42,7 +41,7 @@ os.environ.pop('__PYVENV_LAUNCHER__', None)
 os.environ.pop('PYTHONEXECUTABLE', None)
 
 COMMANDS_NO_GIT = {
-    'clean', 'gc', 'hazmat', 'init-templatedir', 'sample-config',
+    'clean', 'gc', 'init-templatedir', 'sample-config',
     'validate-config', 'validate-manifest',
 }
 
@@ -246,11 +245,6 @@ def main(argv: Sequence[str] | None = None) -> int:
 
     _add_cmd('gc', help='Clean unused cached repos.')
 
-    hazmat_parser = _add_cmd(
-        'hazmat', help='Composable tools for rare use in hook `entry`.',
-    )
-    hazmat.add_parsers(hazmat_parser)
-
     init_templatedir_parser = _add_cmd(
         'init-templatedir',
         help=(
@@ -395,8 +389,6 @@ def main(argv: Sequence[str] | None = None) -> int:
             return clean(store)
         elif args.command == 'gc':
             return gc(store)
-        elif args.command == 'hazmat':
-            return hazmat.impl(args)
         elif args.command == 'hook-impl':
             return hook_impl(
                 store,
diff --git a/pre_commit/resources/empty_template_setup.py b/pre_commit/resources/empty_template_setup.py
index e8b1ff02..ef05eef8 100644
--- a/pre_commit/resources/empty_template_setup.py
+++ b/pre_commit/resources/empty_template_setup.py
@@ -1,4 +1,4 @@
 from setuptools import setup
 
 
-setup(name='pre-commit-placeholder-package', version='0.0.0', py_modules=[])
+setup(name='pre-commit-placeholder-package', version='0.0.0')
diff --git a/pre_commit/store.py b/pre_commit/store.py
index dc90c051..9e3b4048 100644
--- a/pre_commit/store.py
+++ b/pre_commit/store.py
@@ -17,6 +17,7 @@ from pre_commit.util import CalledProcessError
 from pre_commit.util import clean_path_on_failure
 from pre_commit.util import cmd_output_b
 from pre_commit.util import resource_text
+from pre_commit.util import rmtree
 
 
 logger = logging.getLogger('pre_commit')
@@ -95,7 +96,7 @@ class Store:
                     '    PRIMARY KEY (repo, ref)'
                     ');',
                 )
-                self._create_configs_table(db)
+                self._create_config_table(db)
 
             # Atomic file move
             os.replace(tmpfile, self.db_path)
@@ -214,7 +215,7 @@ class Store:
             'local', C.LOCAL_REPO_VERSION, deps, _make_local_repo,
         )
 
-    def _create_configs_table(self, db: sqlite3.Connection) -> None:
+    def _create_config_table(self, db: sqlite3.Connection) -> None:
         db.executescript(
             'CREATE TABLE IF NOT EXISTS configs ('
             '   path TEXT NOT NULL,'
@@ -231,5 +232,28 @@ class Store:
             return
         with self.connect() as db:
             # TODO: eventually remove this and only create in _create
-            self._create_configs_table(db)
+            self._create_config_table(db)
             db.execute('INSERT OR IGNORE INTO configs VALUES (?)', (path,))
+
+    def select_all_configs(self) -> list[str]:
+        with self.connect() as db:
+            self._create_config_table(db)
+            rows = db.execute('SELECT path FROM configs').fetchall()
+            return [path for path, in rows]
+
+    def delete_configs(self, configs: list[str]) -> None:
+        with self.connect() as db:
+            rows = [(path,) for path in configs]
+            db.executemany('DELETE FROM configs WHERE path = ?', rows)
+
+    def select_all_repos(self) -> list[tuple[str, str, str]]:
+        with self.connect() as db:
+            return db.execute('SELECT repo, ref, path from repos').fetchall()
+
+    def delete_repo(self, db_repo_name: str, ref: str, path: str) -> None:
+        with self.connect() as db:
+            db.execute(
+                'DELETE FROM repos WHERE repo = ? and ref = ?',
+                (db_repo_name, ref),
+            )
+        rmtree(path)
diff --git a/setup.cfg b/setup.cfg
index a95ee447..be031c3e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 4.5.1
+version = 4.4.0
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown
diff --git a/testing/zipapp/make b/testing/zipapp/make
index 43bb4373..165046f6 100755
--- a/testing/zipapp/make
+++ b/testing/zipapp/make
@@ -107,6 +107,9 @@ def main() -> int:
         shebang = '/usr/bin/env python3'
         zipapp.create_archive(tmpdir, filename, interpreter=shebang)
 
+    with open(f'{filename}.sha256sum', 'w') as f:
+        subprocess.check_call(('sha256sum', filename), stdout=f)
+
     return 0
 
 
diff --git a/tests/clientlib_test.py b/tests/clientlib_test.py
index 2c42b80c..93c698f7 100644
--- a/tests/clientlib_test.py
+++ b/tests/clientlib_test.py
@@ -12,8 +12,6 @@ from pre_commit.clientlib import CONFIG_HOOK_DICT
 from pre_commit.clientlib import CONFIG_REPO_DICT
 from pre_commit.clientlib import CONFIG_SCHEMA
 from pre_commit.clientlib import DEFAULT_LANGUAGE_VERSION
-from pre_commit.clientlib import InvalidManifestError
-from pre_commit.clientlib import load_manifest
 from pre_commit.clientlib import MANIFEST_HOOK_DICT
 from pre_commit.clientlib import MANIFEST_SCHEMA
 from pre_commit.clientlib import META_HOOK_DICT
@@ -590,18 +588,3 @@ def test_config_hook_stages_defaulting():
         'id': 'fake-hook',
         'stages': ['commit-msg', 'pre-push', 'pre-commit', 'pre-merge-commit'],
     }
-
-
-def test_manifest_v5_forward_compat(tmp_path):
-    manifest = tmp_path.joinpath('.pre-commit-hooks.yaml')
-    manifest.write_text('hooks: {}')
-
-    with pytest.raises(InvalidManifestError) as excinfo:
-        load_manifest(manifest)
-    assert str(excinfo.value) == (
-        f'\n'
-        f'==> File {manifest}\n'
-        f'=====> \n'
-        f'=====> pre-commit version 5 is required but version {C.VERSION} '
-        f'is installed.  Perhaps run `pip install --upgrade pre-commit`.'
-    )
diff --git a/tests/commands/gc_test.py b/tests/commands/gc_test.py
index 992b02f3..95113ed5 100644
--- a/tests/commands/gc_test.py
+++ b/tests/commands/gc_test.py
@@ -19,13 +19,11 @@ from testing.util import git_commit
 
 
 def _repo_count(store):
-    with store.connect() as db:
-        return db.execute('SELECT COUNT(1) FROM repos').fetchone()[0]
+    return len(store.select_all_repos())
 
 
 def _config_count(store):
-    with store.connect() as db:
-        return db.execute('SELECT COUNT(1) FROM configs').fetchone()[0]
+    return len(store.select_all_configs())
 
 
 def _remove_config_assert_cleared(store, cap_out):
@@ -155,8 +153,7 @@ def test_invalid_manifest_gcd(tempdir_factory, store, in_git_dir, cap_out):
     install_hooks(C.CONFIG_FILE, store)
 
     # we'll "break" the manifest to simulate an old version clone
-    with store.connect() as db:
-        path, = db.execute('SELECT path FROM repos').fetchone()
+    (_, _, path), = store.select_all_repos()
     os.remove(os.path.join(path, C.MANIFEST_FILE))
 
     assert _config_count(store) == 1
@@ -165,11 +162,3 @@ def test_invalid_manifest_gcd(tempdir_factory, store, in_git_dir, cap_out):
     assert _config_count(store) == 1
     assert _repo_count(store) == 0
     assert cap_out.get().splitlines()[-1] == '1 repo(s) removed.'
-
-
-def test_gc_pre_1_14_roll_forward(store, cap_out):
-    with store.connect() as db:  # simulate pre-1.14.0
-        db.executescript('DROP TABLE configs')
-
-    assert not gc(store)
-    assert cap_out.get() == '0 repo(s) removed.\n'
diff --git a/tests/commands/hazmat_test.py b/tests/commands/hazmat_test.py
deleted file mode 100644
index df957e36..00000000
--- a/tests/commands/hazmat_test.py
+++ /dev/null
@@ -1,99 +0,0 @@
-from __future__ import annotations
-
-import sys
-
-import pytest
-
-from pre_commit.commands.hazmat import _cmd_filenames
-from pre_commit.commands.hazmat import main
-from testing.util import cwd
-
-
-def test_cmd_filenames_no_dash_dash():
-    with pytest.raises(SystemExit) as excinfo:
-        _cmd_filenames(('no', 'dashdash', 'here'))
-    msg, = excinfo.value.args
-    assert msg == 'hazmat entry must end with `--`'
-
-
-def test_cmd_filenames_no_filenames():
-    cmd, filenames = _cmd_filenames(('hello', 'world', '--'))
-    assert cmd == ('hello', 'world')
-    assert filenames == ()
-
-
-def test_cmd_filenames_some_filenames():
-    cmd, filenames = _cmd_filenames(('hello', 'world', '--', 'f1', 'f2'))
-    assert cmd == ('hello', 'world')
-    assert filenames == ('f1', 'f2')
-
-
-def test_cmd_filenames_multiple_dashdash():
-    cmd, filenames = _cmd_filenames(('hello', '--', 'arg', '--', 'f1', 'f2'))
-    assert cmd == ('hello', '--', 'arg')
-    assert filenames == ('f1', 'f2')
-
-
-def test_cd_unexpected_filename():
-    with pytest.raises(SystemExit) as excinfo:
-        main(('cd', 'subdir', 'cmd', '--', 'subdir/1', 'not-subdir/2'))
-    msg, = excinfo.value.args
-    assert msg == "unexpected file without prefix='subdir/': not-subdir/2"
-
-
-def _norm(out):
-    return out.replace('\r\n', '\n')
-
-
-def test_cd(tmp_path, capfd):
-    subdir = tmp_path.joinpath('subdir')
-    subdir.mkdir()
-    subdir.joinpath('a').write_text('a')
-    subdir.joinpath('b').write_text('b')
-
-    with cwd(tmp_path):
-        ret = main((
-            'cd', 'subdir',
-            sys.executable, '-c',
-            'import os; print(os.getcwd());'
-            'import sys; [print(open(f).read()) for f in sys.argv[1:]]',
-            '--',
-            'subdir/a', 'subdir/b',
-        ))
-
-    assert ret == 0
-    out, err = capfd.readouterr()
-    assert _norm(out) == f'{subdir}\na\nb\n'
-    assert err == ''
-
-
-def test_ignore_exit_code(capfd):
-    ret = main((
-        'ignore-exit-code', sys.executable, '-c', 'raise SystemExit("bye")',
-    ))
-    assert ret == 0
-    out, err = capfd.readouterr()
-    assert out == ''
-    assert _norm(err) == 'bye\n'
-
-
-def test_n1(capfd):
-    ret = main((
-        'n1', sys.executable, '-c', 'import sys; print(sys.argv[1:])',
-        '--',
-        'foo', 'bar', 'baz',
-    ))
-    assert ret == 0
-    out, err = capfd.readouterr()
-    assert _norm(out) == "['foo']\n['bar']\n['baz']\n"
-    assert err == ''
-
-
-def test_n1_some_error_code():
-    ret = main((
-        'n1', sys.executable, '-c',
-        'import sys; raise SystemExit(sys.argv[1] == "error")',
-        '--',
-        'ok', 'error', 'ok',
-    ))
-    assert ret == 1
diff --git a/tests/lang_base_test.py b/tests/lang_base_test.py
index 9fac83da..da289aef 100644
--- a/tests/lang_base_test.py
+++ b/tests/lang_base_test.py
@@ -164,15 +164,3 @@ def test_basic_run_hook(tmp_path):
     assert ret == 0
     out = out.replace(b'\r\n', b'\n')
     assert out == b'hi hello file file file\n'
-
-
-def test_hook_cmd():
-    assert lang_base.hook_cmd('echo hi', ()) == ('echo', 'hi')
-
-
-def test_hook_cmd_hazmat():
-    ret = lang_base.hook_cmd('pre-commit hazmat cd a echo -- b', ())
-    assert ret == (
-        sys.executable, '-m', 'pre_commit.commands.hazmat',
-        'cd', 'a', 'echo', '--', 'b',
-    )
diff --git a/tests/languages/python_test.py b/tests/languages/python_test.py
index 593634b7..565525a4 100644
--- a/tests/languages/python_test.py
+++ b/tests/languages/python_test.py
@@ -10,8 +10,6 @@ import pre_commit.constants as C
 from pre_commit.envcontext import envcontext
 from pre_commit.languages import python
 from pre_commit.prefix import Prefix
-from pre_commit.store import _make_local_repo
-from pre_commit.util import cmd_output_b
 from pre_commit.util import make_executable
 from pre_commit.util import win_exe
 from testing.auto_namedtuple import auto_namedtuple
@@ -353,15 +351,3 @@ def test_python_hook_weird_setup_cfg(tmp_path):
 
     ret = run_language(tmp_path, python, 'socks', [os.devnull])
     assert ret == (0, f'[{os.devnull!r}]\nhello hello\n'.encode())
-
-
-def test_local_repo_with_other_artifacts(tmp_path):
-    cmd_output_b('git', 'init', tmp_path)
-    _make_local_repo(str(tmp_path))
-    # pretend a rust install also ran here
-    tmp_path.joinpath('target').mkdir()
-
-    ret, out = run_language(tmp_path, python, 'python --version')
-
-    assert ret == 0
-    assert out.startswith(b'Python ')
diff --git a/tests/main_test.py b/tests/main_test.py
index fed085fc..945349fa 100644
--- a/tests/main_test.py
+++ b/tests/main_test.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import argparse
-import contextlib
 import os.path
 from unittest import mock
 
@@ -9,7 +8,6 @@ import pytest
 
 import pre_commit.constants as C
 from pre_commit import main
-from pre_commit.commands import hazmat
 from pre_commit.errors import FatalError
 from pre_commit.util import cmd_output
 from testing.auto_namedtuple import auto_namedtuple
@@ -99,9 +97,11 @@ CMDS = tuple(fn.replace('_', '-') for fn in FNS)
 
 @pytest.fixture
 def mock_commands():
-    with contextlib.ExitStack() as ctx:
-        mcks = {f: ctx.enter_context(mock.patch.object(main, f)) for f in FNS}
-        yield auto_namedtuple(**mcks)
+    mcks = {fn: mock.patch.object(main, fn).start() for fn in FNS}
+    ret = auto_namedtuple(**mcks)
+    yield ret
+    for mck in ret:
+        mck.stop()
 
 
 @pytest.fixture
@@ -158,17 +158,6 @@ def test_all_cmds(command, mock_commands, mock_store_dir):
     assert_only_one_mock_called(mock_commands)
 
 
-def test_hazmat(mock_store_dir):
-    with mock.patch.object(hazmat, 'impl') as mck:
-        main.main(('hazmat', 'cd', 'subdir', '--', 'cmd', '--', 'f1', 'f2'))
-    assert mck.call_count == 1
-    (arg,), dct = mck.call_args
-    assert dct == {}
-    assert arg.tool == 'cd'
-    assert arg.subdir == 'subdir'
-    assert arg.cmd == ['cmd', '--', 'f1', 'f2']
-
-
 def test_try_repo(mock_store_dir):
     with mock.patch.object(main, 'try_repo') as patch:
         main.main(('try-repo', '.'))
diff --git a/tests/repository_test.py b/tests/repository_test.py
index 5d71c3e4..b1c7a002 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -506,14 +506,3 @@ def test_args_with_spaces_and_quotes(tmp_path):
 
     expected = b"['i have spaces', 'and\"\\'quotes', '$and !this']\n"
     assert ret == (0, expected)
-
-
-def test_hazmat(tmp_path):
-    ret = run_language(
-        tmp_path, unsupported,
-        f'pre-commit hazmat ignore-exit-code {shlex.quote(sys.executable)} '
-        f"-c 'import sys; raise SystemExit(sys.argv[1:])'",
-        ('f1', 'f2'),
-    )
-    expected = b"['f1', 'f2']\n"
-    assert ret == (0, expected)
diff --git a/tests/store_test.py b/tests/store_test.py
index 13f198ea..7d4dffb0 100644
--- a/tests/store_test.py
+++ b/tests/store_test.py
@@ -22,17 +22,6 @@ from testing.util import git_commit
 from testing.util import xfailif_windows
 
 
-def _select_all_configs(store: Store) -> list[str]:
-    with store.connect() as db:
-        rows = db.execute('SELECT * FROM configs').fetchall()
-        return [path for path, in rows]
-
-
-def _select_all_repos(store: Store) -> list[tuple[str, str, str]]:
-    with store.connect() as db:
-        return db.execute('SELECT repo, ref, path FROM repos').fetchall()
-
-
 def test_our_session_fixture_works():
     """There's a session fixture which makes `Store` invariantly raise to
     prevent writing to the home directory.
@@ -102,7 +91,7 @@ def test_clone(store, tempdir_factory, caplog):
     assert git.head_rev(ret) == rev
 
     # Assert there's an entry in the sqlite db for this
-    assert _select_all_repos(store) == [(path, rev, ret)]
+    assert store.select_all_repos() == [(path, rev, ret)]
 
 
 def test_warning_for_deprecated_stages_on_init(store, tempdir_factory, caplog):
@@ -228,7 +217,7 @@ def test_clone_shallow_failure_fallback_to_complete(
     assert git.head_rev(ret) == rev
 
     # Assert there's an entry in the sqlite db for this
-    assert _select_all_repos(store) == [(path, rev, ret)]
+    assert store.select_all_repos() == [(path, rev, ret)]
 
 
 def test_clone_tag_not_on_mainline(store, tempdir_factory):
@@ -276,7 +265,7 @@ def test_mark_config_as_used(store, tmpdir):
     with tmpdir.as_cwd():
         f = tmpdir.join('f').ensure()
         store.mark_config_used('f')
-        assert _select_all_configs(store) == [f.strpath]
+        assert store.select_all_configs() == [f.strpath]
 
 
 def test_mark_config_as_used_idempotent(store, tmpdir):
@@ -286,12 +275,21 @@ def test_mark_config_as_used_idempotent(store, tmpdir):
 
 def test_mark_config_as_used_does_not_exist(store):
     store.mark_config_used('f')
-    assert _select_all_configs(store) == []
+    assert store.select_all_configs() == []
+
+
+def _simulate_pre_1_14_0(store):
+    with store.connect() as db:
+        db.executescript('DROP TABLE configs')
+
+
+def test_select_all_configs_roll_forward(store):
+    _simulate_pre_1_14_0(store)
+    assert store.select_all_configs() == []
 
 
 def test_mark_config_as_used_roll_forward(store, tmpdir):
-    with store.connect() as db:  # simulate pre-1.14.0
-        db.executescript('DROP TABLE configs')
+    _simulate_pre_1_14_0(store)
     test_mark_config_as_used(store, tmpdir)
 
 
@@ -316,7 +314,7 @@ def test_mark_config_as_used_readonly(tmpdir):
     assert store.readonly
     # should be skipped due to readonly
     store.mark_config_used(str(cfg))
-    assert _select_all_configs(store) == []
+    assert store.select_all_configs() == []
 
 
 def test_clone_with_recursive_submodules(store, tmp_path):