feat(db): Add database migration support, implements #19

Migrations allow us to keep track of database changes and upgrading databases if needed.

* Add initial migrations for core Flaschengeist
* Add migrations to balance
* Add migrations to pricelist

* Skip plugins with not satisfied dependencies.

flaschengeist/alembic/alembic.ini

@@ -0,0 +1,53 @@
+# A generic, single database configuration.
+# No used by flaschengeist
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+version_path_separator = os
+version_locations = %(here)s/migrations
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic,flask_migrate
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

flaschengeist/alembic/env.py

@@ -0,0 +1,74 @@
+import logging
+from logging.config import fileConfig
+from pathlib import Path
+from flask import current_app
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(Path(config.get_main_option("script_location")) / config.config_file_name.split("/")[-1])
+logger = logging.getLogger("alembic.env")
+
+config.set_main_option("sqlalchemy.url", str(current_app.extensions["migrate"].db.get_engine().url).replace("%", "%%"))
+target_metadata = current_app.extensions["migrate"].db.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url, target_metadata=target_metadata, literal_binds=True)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, "autogenerate", False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info("No changes in schema detected.")
+
+    connectable = current_app.extensions["migrate"].db.get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            process_revision_directives=process_revision_directives,
+            **current_app.extensions["migrate"].configure_args,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

flaschengeist/alembic/migrations/255b93b6beed_flaschengeist_initial.py

@@ -0,0 +1,132 @@
+"""Flaschengeist: Initial
+
+Revision ID: 255b93b6beed
+Revises: 
+Create Date: 2022-02-23 14:33:02.851388
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import flaschengeist
+
+
+# revision identifiers, used by Alembic.
+revision = "255b93b6beed"
+down_revision = None
+branch_labels = ("flaschengeist",)
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "image",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("filename_", sa.String(length=127), nullable=False),
+        sa.Column("mimetype_", sa.String(length=30), nullable=False),
+        sa.Column("thumbnail_", sa.String(length=127), nullable=True),
+        sa.Column("path_", sa.String(length=127), nullable=True),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_image")),
+    )
+    op.create_table(
+        "permission",
+        sa.Column("name", sa.String(length=30), nullable=True),
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_permission")),
+        sa.UniqueConstraint("name", name=op.f("uq_permission_name")),
+    )
+    op.create_table(
+        "role",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=30), nullable=True),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_role")),
+        sa.UniqueConstraint("name", name=op.f("uq_role_name")),
+    )
+    op.create_table(
+        "role_x_permission",
+        sa.Column("role_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("permission_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["permission_id"], ["permission.id"], name=op.f("fk_role_x_permission_permission_id_permission")
+        ),
+        sa.ForeignKeyConstraint(["role_id"], ["role.id"], name=op.f("fk_role_x_permission_role_id_role")),
+    )
+    op.create_table(
+        "user",
+        sa.Column("userid", sa.String(length=30), nullable=False),
+        sa.Column("display_name", sa.String(length=30), nullable=True),
+        sa.Column("firstname", sa.String(length=50), nullable=False),
+        sa.Column("lastname", sa.String(length=50), nullable=False),
+        sa.Column("deleted", sa.Boolean(), nullable=True),
+        sa.Column("birthday", sa.Date(), nullable=True),
+        sa.Column("mail", sa.String(length=60), nullable=True),
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("avatar", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["avatar"], ["image.id"], name=op.f("fk_user_avatar_image")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_user")),
+        sa.UniqueConstraint("userid", name=op.f("uq_user_userid")),
+    )
+    op.create_table(
+        "notification",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("plugin", sa.String(length=127), nullable=False),
+        sa.Column("text", sa.Text(), nullable=True),
+        sa.Column("data", sa.PickleType(), nullable=True),
+        sa.Column("time", flaschengeist.models.UtcDateTime(), nullable=False),
+        sa.Column("user_id", flaschengeist.models.Serial(), nullable=False),
+        sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_notification_user_id_user")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_notification")),
+    )
+    op.create_table(
+        "password_reset",
+        sa.Column("user", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("token", sa.String(length=32), nullable=True),
+        sa.Column("expires", flaschengeist.models.UtcDateTime(), nullable=True),
+        sa.ForeignKeyConstraint(["user"], ["user.id"], name=op.f("fk_password_reset_user_user")),
+        sa.PrimaryKeyConstraint("user", name=op.f("pk_password_reset")),
+    )
+    op.create_table(
+        "session",
+        sa.Column("expires", flaschengeist.models.UtcDateTime(), nullable=True),
+        sa.Column("token", sa.String(length=32), nullable=True),
+        sa.Column("lifetime", sa.Integer(), nullable=True),
+        sa.Column("browser", sa.String(length=30), nullable=True),
+        sa.Column("platform", sa.String(length=30), nullable=True),
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("user_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_session_user_id_user")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_session")),
+        sa.UniqueConstraint("token", name=op.f("uq_session_token")),
+    )
+    op.create_table(
+        "user_attribute",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("user", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=30), nullable=True),
+        sa.Column("value", sa.PickleType(), nullable=True),
+        sa.ForeignKeyConstraint(["user"], ["user.id"], name=op.f("fk_user_attribute_user_user")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_user_attribute")),
+    )
+    op.create_table(
+        "user_x_role",
+        sa.Column("user_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("role_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["role_id"], ["role.id"], name=op.f("fk_user_x_role_role_id_role")),
+        sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_user_x_role_user_id_user")),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("user_x_role")
+    op.drop_table("user_attribute")
+    op.drop_table("session")
+    op.drop_table("password_reset")
+    op.drop_table("notification")
+    op.drop_table("user")
+    op.drop_table("role_x_permission")
+    op.drop_table("role")
+    op.drop_table("permission")
+    op.drop_table("image")
+    # ### end Alembic commands ###

flaschengeist/alembic/script.py.mako

@@ -0,0 +1,25 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import flaschengeist
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

flaschengeist/app.py

@@ -1,6 +1,6 @@
 import enum
 
-from flask import Flask, current_app
+from flask import Flask
 from flask_cors import CORS
 from datetime import datetime, date
 from flask.json import JSONEncoder, jsonify
@@ -11,7 +11,6 @@ from werkzeug.exceptions import HTTPException
 from flaschengeist import logger
 from flaschengeist.utils.hook import Hook
 from flaschengeist.plugins import AuthPlugin
-from flaschengeist.controller import roleController
 from flaschengeist.config import config, configure_app
 
 
@@ -37,10 +36,9 @@ class CustomJSONEncoder(JSONEncoder):
 
 
 @Hook("plugins.loaded")
-def __load_plugins(app):
+def load_plugins(app: Flask):
-    logger.debug("Search for plugins")
-
     app.config["FG_PLUGINS"] = {}
+
     for entry_point in entry_points(group="flaschengeist.plugins"):
         logger.debug(f"Found plugin: {entry_point.name} ({entry_point.dist.version})")
 
@@ -72,37 +70,22 @@ def __load_plugins(app):
         else:
             logger.debug(f"Skip disabled plugin {entry_point.name}")
     if "FG_AUTH_BACKEND" not in app.config:
-        logger.error("No authentication plugin configured or authentication plugin not found")
+        logger.fatal("No authentication plugin configured or authentication plugin not found")
         raise RuntimeError("No authentication plugin configured or authentication plugin not found")
 
 
-@Hook("plugins.installed")
+def create_app(test_config=None, cli=False):
-def install_all():
-    from flaschengeist.database import db
-
-    db.create_all()
-    db.session.commit()
-    for name, plugin in current_app.config["FG_PLUGINS"].items():
-        if not plugin:
-            logger.debug(f"Skip disabled plugin: {name}")
-            continue
-        logger.info(f"Install plugin {name}")
-        plugin.install()
-        if plugin.permissions:
-            roleController.create_permissions(plugin.permissions)
-
-
-def create_app(test_config=None):
     app = Flask("flaschengeist")
     app.json_encoder = CustomJSONEncoder
     CORS(app)
 
     with app.app_context():
-        from flaschengeist.database import db
+        from flaschengeist.database import db, migrate
 
         configure_app(app, test_config)
         db.init_app(app)
-        __load_plugins(app)
+        migrate.init_app(app, db, compare_type=True)
+        load_plugins(app)
 
     @app.route("/", methods=["GET"])
     def __get_state():

flaschengeist/database.py

@@ -1,6 +1,11 @@
+import os
+from flask_migrate import Migrate, Config
 from flask_sqlalchemy import SQLAlchemy
+from importlib_metadata import EntryPoint
 from sqlalchemy import MetaData
 
+from flaschengeist import logger
+
 # https://alembic.sqlalchemy.org/en/latest/naming.html
 metadata = MetaData(
     naming_convention={
@@ -14,6 +19,45 @@ metadata = MetaData(
 
 
 db = SQLAlchemy(metadata=metadata)
+migrate = Migrate()
+
+
+@migrate.configure
+def configure_alembic(config: Config):
+    """Alembic configuration hook
+
+    Inject all migrations paths into the ``version_locations`` config option.
+    This includes even disabled plugins, as simply disabling a plugin without
+    uninstall can break the alembic version management.
+    """
+    from importlib_metadata import entry_points, distribution
+
+    # Set main script location
+    config.set_main_option(
+        "script_location", str(distribution("flaschengeist").locate_file("") / "flaschengeist" / "alembic")
+    )
+
+    # Set Flaschengeist's migrations
+    migrations = [config.get_main_option("script_location") + "/migrations"]
+
+    # Gather all migration paths
+    ep: EntryPoint
+    for ep in entry_points(group="flaschengeist.plugins"):
+        try:
+            directory = ep.dist.locate_file("")
+            for loc in ep.module.split(".") + ["migrations"]:
+                directory /= loc
+            if directory.exists():
+                logger.debug(f"Adding migration version path {directory}")
+                migrations.append(str(directory.resolve()))
+        except:
+            logger.warning(f"Could not load migrations of plugin {ep.name} for database migration.")
+            logger.debug("Plugin loading failed", exc_info=True)
+
+    # write back seperator (we changed it if neither seperator nor locations were specified)
+    config.set_main_option("version_path_separator", os.pathsep)
+    config.set_main_option("version_locations", os.pathsep.join(set(migrations)))
+    return config
 
 
 def case_sensitive(s):

flaschengeist/plugins/__init__.py

@@ -3,9 +3,11 @@
 .. include:: docs/plugin_development.md
 
 """
+
+from typing import Optional
 from importlib_metadata import Distribution, EntryPoint
-from werkzeug.datastructures import FileStorage
 from werkzeug.exceptions import MethodNotAllowed, NotFound
+from werkzeug.datastructures import FileStorage
 
 from flaschengeist.models.user import _Avatar, User
 from flaschengeist.utils.hook import HookBefore, HookAfter
@@ -77,8 +79,16 @@ class Plugin:
     models = None
     """Optional module containing the SQLAlchemy models used by the plugin"""
 
-    migrations_path = None
+    migrations: Optional[tuple[str, str]] = None
-    """Optional location of the path to migration files, required if custome db tables are used"""
+    """Optional identifiers of the migration versions
+    
+    If custom database tables are used migrations must be provided and the
+    head and removal versions had to be defined, e.g.
+    
+    ```
+    migrations = ("head_hash", "removal_hash")
+    ```
+    """
 
     def __init__(self, entry_point: EntryPoint, config=None):
         """Constructor called by create_app
@@ -96,6 +106,17 @@ class Plugin:
         """
         pass
 
+    def uninstall(self):
+        """Uninstall routine
+
+        If the plugin has custom database tables, make sure to remove them.
+        This can be either done by downgrading the plugin *head* to the *base*.
+        Or use custom migrations for the uninstall and *stamp* some version.
+
+        Is always called with Flask application context.
+        """
+        pass
+
     def get_setting(self, name: str, **kwargs):
         """Get plugin setting from database
 
@@ -148,6 +169,11 @@ class Plugin:
 
 
 class AuthPlugin(Plugin):
+    """Base class for all authentification plugins
+
+    See also `Plugin`
+    """
+
     def login(self, user, pw):
         """Login routine, MUST BE IMPLEMENTED!
 
@@ -210,7 +236,7 @@ class AuthPlugin(Plugin):
         """
         raise MethodNotAllowed
 
-    def get_avatar(self, user: User) -> _Avatar:
+    def get_avatar(self, user):
         """Retrieve avatar for given user (if supported by auth backend)
 
         Default behavior is to use native Image objects,
@@ -242,7 +268,7 @@ class AuthPlugin(Plugin):
 
         user.avatar_ = imageController.upload_image(file)
 
-    def delete_avatar(self, user: User):
+    def delete_avatar(self, user):
         """Delete the avatar for given user (if supported by auth backend)
 
         Default behavior is to use the imageController and native Image objects.

flaschengeist/plugins/auth/__init__.py

@@ -13,8 +13,8 @@ from flaschengeist.controller import sessionController, userController
 
 
 class AuthRoutePlugin(Plugin):
-    name = "auth"
+    id = "dev.flaschengeist.auth"
-    blueprint = Blueprint(name, __name__)
+    blueprint = Blueprint("auth", __name__)
 
 
 @AuthRoutePlugin.blueprint.route("/auth", methods=["POST"])

flaschengeist/plugins/auth_ldap/__init__.py

@@ -18,7 +18,7 @@ from flaschengeist.plugins import AuthPlugin, before_role_updated
 
 class AuthLDAP(AuthPlugin):
     def __init__(self, entry_point, config):
-        super().__init__(entry_point)
+        super().__init__(entry_point, config)
         app.config.update(
             LDAP_SERVER=config.get("host", "localhost"),
             LDAP_PORT=config.get("port", 389),

flaschengeist/plugins/auth_plain/__init__.py

@@ -14,6 +14,8 @@ from flaschengeist import logger
 
 
 class AuthPlain(AuthPlugin):
+    id = "auth_plain"
+
     def install(self):
         plugins_installed(self.post_install)
 

flaschengeist/plugins/balance/__init__.py

@@ -3,7 +3,7 @@
 Extends users plugin with balance functions
 """
 
-from flask import Blueprint, current_app
+from flask import current_app
 from werkzeug.local import LocalProxy
 from werkzeug.exceptions import NotFound
 
@@ -57,8 +57,10 @@ def service_debit():
 
 class BalancePlugin(Plugin):
     permissions = permissions.permissions
-    plugin: "BalancePlugin" = LocalProxy(lambda: current_app.config["FG_PLUGINS"][BalancePlugin.name])
     models = models
+    migrations = True
+
+    plugin: "BalancePlugin" = LocalProxy(lambda: current_app.config["FG_PLUGINS"][BalancePlugin.name])
 
     def __init__(self, entry_point, config):
         super(BalancePlugin, self).__init__(entry_point, config)

flaschengeist/plugins/balance/migrations/98f2733bbe45_balance_initial.py

@@ -0,0 +1,47 @@
+"""balance: initial
+
+Revision ID: 98f2733bbe45
+Revises: 
+Create Date: 2022-02-23 14:41:03.089145
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import flaschengeist
+
+
+# revision identifiers, used by Alembic.
+revision = "98f2733bbe45"
+down_revision = None
+branch_labels = ("balance",)
+depends_on = "flaschengeist"
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "balance_transaction",
+        sa.Column("receiver_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("sender_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("author_id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("time", flaschengeist.models.UtcDateTime(), nullable=False),
+        sa.Column("amount", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=False),
+        sa.Column("reversal_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["author_id"], ["user.id"], name=op.f("fk_balance_transaction_author_id_user")),
+        sa.ForeignKeyConstraint(["receiver_id"], ["user.id"], name=op.f("fk_balance_transaction_receiver_id_user")),
+        sa.ForeignKeyConstraint(
+            ["reversal_id"],
+            ["balance_transaction.id"],
+            name=op.f("fk_balance_transaction_reversal_id_balance_transaction"),
+        ),
+        sa.ForeignKeyConstraint(["sender_id"], ["user.id"], name=op.f("fk_balance_transaction_sender_id_user")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_balance_transaction")),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("balance_transaction")
+    # ### end Alembic commands ###

flaschengeist/plugins/message_mail.py

@@ -13,7 +13,7 @@ from . import Plugin
 
 class MailMessagePlugin(Plugin):
     def __init__(self, entry_point, config):
-        super().__init__(entry_point)
+        super().__init__(entry_point, config)
         self.server = config["SERVER"]
         self.port = config["PORT"]
         self.user = config["USER"]

flaschengeist/plugins/pricelist/__init__.py

@@ -1,5 +1,6 @@
 """Pricelist plugin"""
 
+import pathlib
 from flask import Blueprint, jsonify, request, current_app
 from werkzeug.local import LocalProxy
 from werkzeug.exceptions import BadRequest, Forbidden, NotFound, Unauthorized
@@ -26,6 +27,7 @@ class PriceListPlugin(Plugin):
     def __init__(self, entry_point, config=None):
         super().__init__(entry_point, config)
         self.blueprint = blueprint
+        self.migrations_path = (pathlib.Path(__file__).parent / "migrations").resolve()
         config = {"discount": 0}
         config.update(config)
 

flaschengeist/plugins/pricelist/migrations/58ab9b6a8839_pricelist_initial.py

@@ -0,0 +1,141 @@
+"""pricelist: initial
+
+Revision ID: 58ab9b6a8839
+Revises: 
+Create Date: 2022-02-23 14:45:30.563647
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import flaschengeist
+
+
+# revision identifiers, used by Alembic.
+revision = "58ab9b6a8839"
+down_revision = None
+branch_labels = ("pricelist",)
+depends_on = "flaschengeist"
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "drink_extra_ingredient",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=30), nullable=False),
+        sa.Column("price", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=True),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_extra_ingredient")),
+        sa.UniqueConstraint("name", name=op.f("uq_drink_extra_ingredient_name")),
+    )
+    op.create_table(
+        "drink_tag",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=30), nullable=False),
+        sa.Column("color", sa.String(length=7), nullable=False),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_tag")),
+        sa.UniqueConstraint("name", name=op.f("uq_drink_tag_name")),
+    )
+    op.create_table(
+        "drink_type",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=30), nullable=False),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_type")),
+        sa.UniqueConstraint("name", name=op.f("uq_drink_type_name")),
+    )
+    op.create_table(
+        "drink",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("article_id", sa.String(length=64), nullable=True),
+        sa.Column("package_size", sa.Integer(), nullable=True),
+        sa.Column("name", sa.String(length=60), nullable=False),
+        sa.Column("volume", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=True),
+        sa.Column("cost_per_volume", sa.Numeric(precision=5, scale=3, asdecimal=False), nullable=True),
+        sa.Column("cost_per_package", sa.Numeric(precision=5, scale=3, asdecimal=False), nullable=True),
+        sa.Column("receipt", sa.PickleType(), nullable=True),
+        sa.Column("type_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("image_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["image_id"], ["image.id"], name=op.f("fk_drink_image_id_image")),
+        sa.ForeignKeyConstraint(["type_id"], ["drink_type.id"], name=op.f("fk_drink_type_id_drink_type")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink")),
+    )
+    op.create_table(
+        "drink_ingredient",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("volume", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=False),
+        sa.Column("ingredient_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["ingredient_id"], ["drink.id"], name=op.f("fk_drink_ingredient_ingredient_id_drink")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_ingredient")),
+    )
+    op.create_table(
+        "drink_price_volume",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("drink_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("volume", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=True),
+        sa.ForeignKeyConstraint(["drink_id"], ["drink.id"], name=op.f("fk_drink_price_volume_drink_id_drink")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_price_volume")),
+    )
+    op.create_table(
+        "drink_x_tag",
+        sa.Column("drink_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("tag_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["drink_id"], ["drink.id"], name=op.f("fk_drink_x_tag_drink_id_drink")),
+        sa.ForeignKeyConstraint(["tag_id"], ["drink_tag.id"], name=op.f("fk_drink_x_tag_tag_id_drink_tag")),
+    )
+    op.create_table(
+        "drink_x_type",
+        sa.Column("drink_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("type_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["drink_id"], ["drink.id"], name=op.f("fk_drink_x_type_drink_id_drink")),
+        sa.ForeignKeyConstraint(["type_id"], ["drink_type.id"], name=op.f("fk_drink_x_type_type_id_drink_type")),
+    )
+    op.create_table(
+        "drink_ingredient_association",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("volume_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("_drink_ingredient_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("_extra_ingredient_id", flaschengeist.models.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["_drink_ingredient_id"],
+            ["drink_ingredient.id"],
+            name=op.f("fk_drink_ingredient_association__drink_ingredient_id_drink_ingredient"),
+        ),
+        sa.ForeignKeyConstraint(
+            ["_extra_ingredient_id"],
+            ["drink_extra_ingredient.id"],
+            name=op.f("fk_drink_ingredient_association__extra_ingredient_id_drink_extra_ingredient"),
+        ),
+        sa.ForeignKeyConstraint(
+            ["volume_id"],
+            ["drink_price_volume.id"],
+            name=op.f("fk_drink_ingredient_association_volume_id_drink_price_volume"),
+        ),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_ingredient_association")),
+    )
+    op.create_table(
+        "drink_price",
+        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("price", sa.Numeric(precision=5, scale=2, asdecimal=False), nullable=True),
+        sa.Column("volume_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("public", sa.Boolean(), nullable=True),
+        sa.Column("description", sa.String(length=30), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["volume_id"], ["drink_price_volume.id"], name=op.f("fk_drink_price_volume_id_drink_price_volume")
+        ),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_drink_price")),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("drink_price")
+    op.drop_table("drink_ingredient_association")
+    op.drop_table("drink_x_type")
+    op.drop_table("drink_x_tag")
+    op.drop_table("drink_price_volume")
+    op.drop_table("drink_ingredient")
+    op.drop_table("drink")
+    op.drop_table("drink_type")
+    op.drop_table("drink_tag")
+    op.drop_table("drink_extra_ingredient")
+    # ### end Alembic commands ###

setup.cfg

@@ -25,13 +25,13 @@ install_requires =
     Flask>=2.0
     Pillow>=8.4.0
     flask_cors
+    flask_migrate>=3.1.0
     flask_sqlalchemy>=2.5
     # Importlib requirement can be dropped when python requirement is >= 3.10
     importlib_metadata>=4.3
     sqlalchemy>=1.4.26
     toml
-    werkzeug
+    werkzeug >= 2.0
-    
 
 [options.extras_require]
 argon = argon2-cffi
@@ -42,7 +42,7 @@ mysql =
     mysqlclient;platform_system!='Windows'
 
 [options.package_data]
-* = *.toml
+* = *.toml, script.py.mako
 
 [options.entry_points]
 console_scripts =