diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2fc071e..651b918 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # ChangeLog
 
+## 0.3
+
+### 0.3.0
+
+- Refactoring migrate logic, and this version is not compatible with previous version.
+- Now there don't need `old_models.py` and it store in database.
+- Upgrade steps:
+  1. Upgrade aerich version.
+  2. Drop aerich model in db and recreate with new struct.
+  3. Delete `migrations/{app}` folder and rerun `aerich init-db`.
+  4. Update model and `aerich migrate` normally.
+
 ## 0.2
 
 ### 0.2.5
diff --git a/README.md b/README.md
index 30de17b..fe58f77 100644
--- a/README.md
+++ b/README.md
@@ -125,7 +125,19 @@ Success upgrade 1_202029051520102929_drop_column.json
 
 Now your db is migrated to latest.
 
-### Downgrade to previous version
+### Downgrade to specified version
+
+```shell
+$ aerich init -h
+
+Usage: aerich downgrade [OPTIONS]
+
+  Downgrade to specified version.
+
+Options:
+  -v, --version INTEGER  Specified version, default to last.  [default: -1]
+  -h, --help             Show this message and exit.
+```
 
 ```shell
 $ aerich downgrade
@@ -133,7 +145,7 @@ $ aerich downgrade
 Success downgrade 1_202029051520102929_drop_column.json
 ```
 
-Now your db rollback to previous version.
+Now your db rollback to specified version.
 
 ### Show history
 
diff --git a/aerich/__init__.py b/aerich/__init__.py
index fe404ae..493f741 100644
--- a/aerich/__init__.py
+++ b/aerich/__init__.py
@@ -1 +1 @@
-__version__ = "0.2.5"
+__version__ = "0.3.0"
diff --git a/aerich/cli.py b/aerich/cli.py
index c62e27e..a236ea1 100644
--- a/aerich/cli.py
+++ b/aerich/cli.py
@@ -26,7 +26,9 @@ def coro(f):
     @wraps(f)
     def wrapper(*args, **kwargs):
         loop = asyncio.get_event_loop()
-        return loop.run_until_complete(f(*args, **kwargs))
+        ctx = args[0]
+        loop.run_until_complete(f(*args, **kwargs))
+        Migrate.remove_old_model_file(ctx.obj["app"], ctx.obj["location"])
 
     return wrapper
 
@@ -67,7 +69,7 @@ async def cli(ctx: Context, config, app, name):
         ctx.obj["config"] = tortoise_config
         ctx.obj["location"] = location
         ctx.obj["app"] = app
-
+        Migrate.app = app
         if invoked_subcommand != "init-db":
             await Migrate.init_with_old_models(tortoise_config, app, location)
 
@@ -77,64 +79,82 @@ async def cli(ctx: Context, config, app, name):
 @click.pass_context
 @coro
 async def migrate(ctx: Context, name):
-    config = ctx.obj["config"]
-    location = ctx.obj["location"]
-    app = ctx.obj["app"]
     ret = await Migrate.migrate(name)
     if not ret:
         return click.secho("No changes detected", fg=Color.yellow)
-    Migrate.write_old_models(config, app, location)
     click.secho(f"Success migrate {ret}", fg=Color.green)
 
 
-@cli.command(help="Upgrade to latest version.")
+@cli.command(help="Upgrade to specified version.")
 @click.pass_context
 @coro
 async def upgrade(ctx: Context):
     config = ctx.obj["config"]
     app = ctx.obj["app"]
+    location = ctx.obj["location"]
     migrated = False
-    for version in Migrate.get_all_version_files():
+    for version_file in Migrate.get_all_version_files():
         try:
-            exists = await Aerich.exists(version=version, app=app)
+            exists = await Aerich.exists(version=version_file, app=app)
         except OperationalError:
             exists = False
         if not exists:
             async with in_transaction(get_app_connection_name(config, app)) as conn:
-                file_path = os.path.join(Migrate.migrate_location, version)
+                file_path = os.path.join(Migrate.migrate_location, version_file)
                 with open(file_path, "r", encoding="utf-8") as f:
                     content = json.load(f)
                     upgrade_query_list = content.get("upgrade")
                     for upgrade_query in upgrade_query_list:
                         await conn.execute_script(upgrade_query)
-                await Aerich.create(version=version, app=app)
-            click.secho(f"Success upgrade {version}", fg=Color.green)
+                await Aerich.create(
+                    version=version_file,
+                    app=app,
+                    content=Migrate.get_models_content(config, app, location),
+                )
+            click.secho(f"Success upgrade {version_file}", fg=Color.green)
             migrated = True
     if not migrated:
         click.secho("No migrate items", fg=Color.yellow)
 
 
-@cli.command(help="Downgrade to previous version.")
+@cli.command(help="Downgrade to specified version.")
+@click.option(
+    "-v",
+    "--version",
+    default=-1,
+    type=int,
+    show_default=True,
+    help="Specified version, default to last.",
+)
 @click.pass_context
 @coro
-async def downgrade(ctx: Context):
+async def downgrade(ctx: Context, version: int):
     app = ctx.obj["app"]
     config = ctx.obj["config"]
-    last_version = await Migrate.get_last_version()
-    if not last_version:
-        return click.secho("No last version found", fg=Color.yellow)
-    file = last_version.version
-    async with in_transaction(get_app_connection_name(config, app)) as conn:
-        file_path = os.path.join(Migrate.migrate_location, file)
-        with open(file_path, "r", encoding="utf-8") as f:
-            content = json.load(f)
-            downgrade_query_list = content.get("downgrade")
-            if not downgrade_query_list:
-                return click.secho("No downgrade item found", fg=Color.yellow)
-            for downgrade_query in downgrade_query_list:
-                await conn.execute_query(downgrade_query)
-            await last_version.delete()
-        return click.secho(f"Success downgrade {file}", fg=Color.green)
+    if version == -1:
+        specified_version = await Migrate.get_last_version()
+    else:
+        specified_version = await Aerich.filter(app=app, version__startswith=f"{version}_").first()
+    if not specified_version:
+        return click.secho("No specified version found", fg=Color.yellow)
+    if version == -1:
+        versions = [specified_version]
+    else:
+        versions = await Aerich.filter(app=app, pk__gte=specified_version.pk)
+    for version in versions:
+        file = version.version
+        async with in_transaction(get_app_connection_name(config, app)) as conn:
+            file_path = os.path.join(Migrate.migrate_location, file)
+            with open(file_path, "r", encoding="utf-8") as f:
+                content = json.load(f)
+                downgrade_query_list = content.get("downgrade")
+                if not downgrade_query_list:
+                    return click.secho("No downgrade item found", fg=Color.yellow)
+                for downgrade_query in downgrade_query_list:
+                    await conn.execute_query(downgrade_query)
+                await version.delete()
+            os.unlink(file_path)
+            click.secho(f"Success downgrade {file}", fg=Color.green)
 
 
 @cli.command(help="Show current available heads in migrate location.")
@@ -149,7 +169,7 @@ async def heads(ctx: Context):
             click.secho(version, fg=Color.green)
             is_heads = True
     if not is_heads:
-        click.secho("No available heads,try migrate", fg=Color.green)
+        click.secho("No available heads,try migrate first", fg=Color.green)
 
 
 @cli.command(help="List all migrate items.")
@@ -219,8 +239,6 @@ async def init_db(ctx: Context, safe):
     else:
         return click.secho(f"Inited {app} already", fg=Color.yellow)
 
-    Migrate.write_old_models(config, app, location)
-
     await Tortoise.init(config=config)
     connection = get_app_connection(config, app)
     await generate_schema_for_client(connection, safe)
@@ -228,7 +246,9 @@ async def init_db(ctx: Context, safe):
     schema = get_schema_sql(connection, safe)
 
     version = await Migrate.generate_version()
-    await Aerich.create(version=version, app=app)
+    await Aerich.create(
+        version=version, app=app, content=Migrate.get_models_content(config, app, location)
+    )
     with open(os.path.join(dirname, version), "w", encoding="utf-8") as f:
         content = {
             "upgrade": [schema],
diff --git a/aerich/ddl/sqlite/__init__.py b/aerich/ddl/sqlite/__init__.py
index 3b3eca8..ee66618 100644
--- a/aerich/ddl/sqlite/__init__.py
+++ b/aerich/ddl/sqlite/__init__.py
@@ -13,7 +13,7 @@ class SqliteDDL(BaseDDL):
     DIALECT = SqliteSchemaGenerator.DIALECT
 
     def drop_column(self, model: "Type[Model]", column_name: str):
-        raise NotSupportError("Drop column is not support in SQLite.")
+        raise NotSupportError("Drop column is unsupported in SQLite.")
 
     def modify_column(self, model: "Type[Model]", field_object: Field):
-        raise NotSupportError("Modify column is not support in SQLite.")
+        raise NotSupportError("Modify column is unsupported in SQLite.")
diff --git a/aerich/migrate.py b/aerich/migrate.py
index fb9ca21..a35cd26 100644
--- a/aerich/migrate.py
+++ b/aerich/migrate.py
@@ -3,6 +3,7 @@ import os
 import re
 from datetime import datetime
 from importlib import import_module
+from io import StringIO
 from typing import Dict, List, Tuple, Type
 
 import click
@@ -41,8 +42,8 @@ class Migrate:
     dialect: str
 
     @classmethod
-    def get_old_model_file(cls):
-        return cls.old_models + ".py"
+    def get_old_model_file(cls, app: str, location: str):
+        return os.path.join(location, app, cls.old_models + ".py")
 
     @classmethod
     def get_all_version_files(cls) -> List[str]:
@@ -56,9 +57,21 @@ class Migrate:
         return await Aerich.filter(app=cls.app).first()
 
     @classmethod
-    async def init_with_old_models(cls, config: dict, app: str, location: str):
-        migrate_config = cls._get_migrate_config(config, app, location)
+    def remove_old_model_file(cls, app: str, location: str):
+        try:
+            os.unlink(cls.get_old_model_file(app, location))
+        except FileNotFoundError:
+            pass
 
+    @classmethod
+    async def init_with_old_models(cls, config: dict, app: str, location: str):
+        await Tortoise.init(config=config)
+        last_version = await cls.get_last_version()
+        content = last_version.content
+        with open(cls.get_old_model_file(app, location), "w") as f:
+            f.write(content)
+
+        migrate_config = cls._get_migrate_config(config, app, location)
         cls.app = app
         cls.migrate_config = migrate_config
         cls.migrate_location = os.path.join(location, app)
@@ -102,6 +115,10 @@ class Migrate:
     @classmethod
     async def _generate_diff_sql(cls, name):
         version = await cls.generate_version(name)
+        # delete if same version exists
+        for version_file in cls.get_all_version_files():
+            if version_file.startswith(version.split("_")[0]):
+                os.unlink(os.path.join(cls.migrate_location, version_file))
         content = {
             "upgrade": cls.upgrade_operators,
             "downgrade": cls.downgrade_operators,
@@ -151,26 +168,6 @@ class Migrate:
             else:
                 cls.downgrade_operators.append(operator)
 
-    @classmethod
-    def cp_models(
-        cls, app: str, model_files: List[str], old_model_file,
-    ):
-        """
-        cp currents models to old_model_files
-        :param app:
-        :param model_files:
-        :param old_model_file:
-        :return:
-        """
-        pattern = rf"(\n)?('|\")({app})(.\w+)('|\")"
-        for i, model_file in enumerate(model_files):
-            with open(model_file, "r", encoding="utf-8") as f:
-                content = f.read()
-            ret = re.sub(pattern, rf"\2{cls.diff_app}\4\5", content)
-            mode = "w" if i == 0 else "a"
-            with open(old_model_file, mode, encoding="utf-8") as f:
-                f.write(f"{ret}\n")
-
     @classmethod
     def _get_migrate_config(cls, config: dict, app: str, location: str):
         """
@@ -189,7 +186,7 @@ class Migrate:
         return config
 
     @classmethod
-    def write_old_models(cls, config: dict, app: str, location: str):
+    def get_models_content(cls, config: dict, app: str, location: str):
         """
         write new models to old models
         :param config:
@@ -197,14 +194,18 @@ class Migrate:
         :param location:
         :return:
         """
-        cls.app = app
-
         old_model_files = []
         models = config.get("apps").get(app).get("models")
         for model in models:
             old_model_files.append(import_module(model).__file__)
-
-        cls.cp_models(app, old_model_files, os.path.join(location, app, cls.get_old_model_file()))
+        pattern = rf"(\n)?('|\")({app})(.\w+)('|\")"
+        str_io = StringIO()
+        for i, model_file in enumerate(old_model_files):
+            with open(model_file, "r", encoding="utf-8") as f:
+                content = f.read()
+            ret = re.sub(pattern, rf"\2{cls.diff_app}\4\5", content)
+            str_io.write(f"{ret}\n")
+        return str_io.getvalue()
 
     @classmethod
     def diff_models(
diff --git a/aerich/models.py b/aerich/models.py
index 8589d6d..da57d67 100644
--- a/aerich/models.py
+++ b/aerich/models.py
@@ -6,6 +6,7 @@ MAX_VERSION_LENGTH = 255
 class Aerich(Model):
     version = fields.CharField(max_length=MAX_VERSION_LENGTH)
     app = fields.CharField(max_length=20)
+    content = fields.TextField()
 
     class Meta:
         ordering = ["-id"]
diff --git a/poetry.lock b/poetry.lock
index d9c207c..5fb71c2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -177,7 +177,7 @@ description = "the modular source code checker: pep8 pyflakes and co"
 name = "flake8"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "3.8.3"
+version = "3.8.4"
 
 [package.dependencies]
 mccabe = ">=0.6.0,<0.7.0"
@@ -205,7 +205,7 @@ description = "Python Git Library"
 name = "gitpython"
 optional = false
 python-versions = ">=3.4"
-version = "3.1.8"
+version = "3.1.9"
 
 [package.dependencies]
 gitdb = ">=4.0.1,<5"
@@ -248,7 +248,7 @@ description = "A Python utility / library to sort Python imports."
 name = "isort"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "5.5.3"
+version = "5.6.1"
 
 [package.extras]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
@@ -263,14 +263,6 @@ optional = false
 python-versions = "*"
 version = "0.6.1"
 
-[[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
-name = "more-itertools"
-optional = false
-python-versions = ">=3.5"
-version = "8.5.0"
-
 [[package]]
 category = "dev"
 description = "Core utilities for Python packages"
@@ -385,7 +377,7 @@ description = "A SQL query builder API for Python"
 name = "pypika"
 optional = false
 python-versions = "*"
-version = "0.40.0"
+version = "0.42.1"
 
 [[package]]
 category = "dev"
@@ -393,14 +385,13 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "6.0.2"
+version = "6.1.1"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
 attrs = ">=17.4.0"
 colorama = "*"
 iniconfig = "*"
-more-itertools = ">=4.0.0"
 packaging = "*"
 pluggy = ">=0.12,<1.0"
 py = ">=1.8.2"
@@ -485,7 +476,7 @@ description = "Alternative regular expression module, to replace re."
 name = "regex"
 optional = false
 python-versions = "*"
-version = "2020.7.14"
+version = "2020.9.27"
 
 [[package]]
 category = "main"
@@ -566,7 +557,7 @@ marker = "python_version < \"3.8\""
 name = "zipp"
 optional = false
 python-versions = ">=3.6"
-version = "3.2.0"
+version = "3.3.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
@@ -577,7 +568,6 @@ dbdrivers = ["aiomysql", "asyncpg"]
 
 [metadata]
 content-hash = "43fe9c0036f4d55d38f82c263887d8a7d9a35a597e02036b70a631955ff73149"
-lock-version = "1.0"
 python-versions = "^3.7"
 
 [metadata.files]
@@ -715,16 +705,16 @@ execnet = [
     {file = "execnet-1.7.1.tar.gz", hash = "sha256:cacb9df31c9680ec5f95553976c4da484d407e85e41c83cb812aa014f0eddc50"},
 ]
 flake8 = [
-    {file = "flake8-3.8.3-py2.py3-none-any.whl", hash = "sha256:15e351d19611c887e482fb960eae4d44845013cc142d42896e9862f775d8cf5c"},
-    {file = "flake8-3.8.3.tar.gz", hash = "sha256:f04b9fcbac03b0a3e58c0ab3a0ecc462e023a9faf046d57794184028123aa208"},
+    {file = "flake8-3.8.4-py2.py3-none-any.whl", hash = "sha256:749dbbd6bfd0cf1318af27bf97a14e28e5ff548ef8e5b1566ccfb25a11e7c839"},
+    {file = "flake8-3.8.4.tar.gz", hash = "sha256:aadae8761ec651813c24be05c6f7b4680857ef6afaae4651a4eccaef97ce6c3b"},
 ]
 gitdb = [
     {file = "gitdb-4.0.5-py3-none-any.whl", hash = "sha256:91f36bfb1ab7949b3b40e23736db18231bf7593edada2ba5c3a174a7b23657ac"},
     {file = "gitdb-4.0.5.tar.gz", hash = "sha256:c9e1f2d0db7ddb9a704c2a0217be31214e91a4fe1dea1efad19ae42ba0c285c9"},
 ]
 gitpython = [
-    {file = "GitPython-3.1.8-py3-none-any.whl", hash = "sha256:1858f4fd089abe92ae465f01d5aaaf55e937eca565fb2c1fce35a51b5f85c910"},
-    {file = "GitPython-3.1.8.tar.gz", hash = "sha256:080bf8e2cf1a2b907634761c2eaefbe83b69930c94c66ad11b65a8252959f912"},
+    {file = "GitPython-3.1.9-py3-none-any.whl", hash = "sha256:138016d519bf4dd55b22c682c904ed2fd0235c3612b2f8f65ce218ff358deed8"},
+    {file = "GitPython-3.1.9.tar.gz", hash = "sha256:a03f728b49ce9597a6655793207c6ab0da55519368ff5961e4a74ae475b9fa8e"},
 ]
 importlib-metadata = [
     {file = "importlib_metadata-2.0.0-py2.py3-none-any.whl", hash = "sha256:cefa1a2f919b866c5beb7c9f7b0ebb4061f30a8a9bf16d609b000e2dfaceb9c3"},
@@ -740,17 +730,13 @@ iso8601 = [
     {file = "iso8601-0.1.13.tar.gz", hash = "sha256:f7dec22af52025d4526be94cc1303c7d8f5379b746a3f54a8c8446384392eeb1"},
 ]
 isort = [
-    {file = "isort-5.5.3-py3-none-any.whl", hash = "sha256:c16eaa7432a1c004c585d79b12ad080c6c421dd18fe27982ca11f95e6898e432"},
-    {file = "isort-5.5.3.tar.gz", hash = "sha256:6187a9f1ce8784cbc6d1b88790a43e6083a6302f03e9ae482acc0f232a98c843"},
+    {file = "isort-5.6.1-py3-none-any.whl", hash = "sha256:dd3211f513f4a92ec1ec1876fc1dc3c686649c349d49523f5b5adbb0814e5960"},
+    {file = "isort-5.6.1.tar.gz", hash = "sha256:2f510f34ae18a8d0958c53eec51ef84fd099f07c4c639676525acbcd7b5bd3ff"},
 ]
 mccabe = [
     {file = "mccabe-0.6.1-py2.py3-none-any.whl", hash = "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42"},
     {file = "mccabe-0.6.1.tar.gz", hash = "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"},
 ]
-more-itertools = [
-    {file = "more-itertools-8.5.0.tar.gz", hash = "sha256:6f83822ae94818eae2612063a5101a7311e68ae8002005b5e05f03fd74a86a20"},
-    {file = "more_itertools-8.5.0-py3-none-any.whl", hash = "sha256:9b30f12df9393f0d28af9210ff8efe48d10c94f73e5daf886f10c4b0b0b4f03c"},
-]
 packaging = [
     {file = "packaging-20.4-py2.py3-none-any.whl", hash = "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"},
     {file = "packaging-20.4.tar.gz", hash = "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8"},
@@ -811,11 +797,11 @@ pyparsing = [
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
 pypika = [
-    {file = "PyPika-0.40.0.tar.gz", hash = "sha256:659d307f7e531b66813619cbce08ecb97eeb302feabbd816ae8844b99496298b"},
+    {file = "PyPika-0.42.1.tar.gz", hash = "sha256:f9466259179d5cb12d6cf3d453f4370a511039a6dd88fcb5089f22ba8824b408"},
 ]
 pytest = [
-    {file = "pytest-6.0.2-py3-none-any.whl", hash = "sha256:0e37f61339c4578776e090c3b8f6b16ce4db333889d65d0efb305243ec544b40"},
-    {file = "pytest-6.0.2.tar.gz", hash = "sha256:c8f57c2a30983f469bf03e68cdfa74dc474ce56b8f280ddcb080dfd91df01043"},
+    {file = "pytest-6.1.1-py3-none-any.whl", hash = "sha256:7a8190790c17d79a11f847fba0b004ee9a8122582ebff4729a082c109e81a4c9"},
+    {file = "pytest-6.1.1.tar.gz", hash = "sha256:8f593023c1a0f916110285b6efd7f99db07d59546e3d8c36fc60e2ab05d3be92"},
 ]
 pytest-asyncio = [
     {file = "pytest-asyncio-0.14.0.tar.gz", hash = "sha256:9882c0c6b24429449f5f969a5158b528f39bde47dc32e85b9f0403965017e700"},
@@ -847,26 +833,33 @@ pyyaml = [
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 ]
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+    {file = "regex-2020.9.27-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:c9443124c67b1515e4fe0bb0aa18df640965e1030f468a2a5dc2589b26d130ad"},
+    {file = "regex-2020.9.27-cp39-cp39-win32.whl", hash = "sha256:49f23ebd5ac073765ecbcf046edc10d63dcab2f4ae2bce160982cb30df0c0302"},
+    {file = "regex-2020.9.27-cp39-cp39-win_amd64.whl", hash = "sha256:3d20024a70b97b4f9546696cbf2fd30bae5f42229fbddf8661261b1eaff0deb7"},
+    {file = "regex-2020.9.27.tar.gz", hash = "sha256:a6f32aea4260dfe0e55dc9733ea162ea38f0ea86aa7d0f77b15beac5bf7b369d"},
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 six = [
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@@ -916,6 +909,6 @@ typing-extensions = [
     {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
 zipp = [
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-    {file = "zipp-3.2.0.tar.gz", hash = "sha256:b52f22895f4cfce194bc8172f3819ee8de7540aa6d873535a8668b730b8b411f"},
+    {file = "zipp-3.3.0-py3-none-any.whl", hash = "sha256:eed8ec0b8d1416b2ca33516a37a08892442f3954dee131e92cfd92d8fe3e7066"},
+    {file = "zipp-3.3.0.tar.gz", hash = "sha256:64ad89efee774d1897a58607895d80789c59778ea02185dd846ac38394a8642b"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 70d0229..6e19077 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aerich"
-version = "0.2.5"
+version = "0.3.0"
 description = "A database migrations tool for Tortoise ORM."
 authors = ["long2ice <long2ice@gmail.com>"]
 license = "Apache-2.0"