works

migrations/README

@@ -1 +1 @@
-Generic single-database configuration.
+Single-database configuration for Flask.

migrations/alembic.ini

@@ -0,0 +1,50 @@
+# A generic, single database configuration.
+
+[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
+
+
+# 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

migrations/env.py

@@ -1,7 +1,7 @@
+import logging
 from logging.config import fileConfig
 
-from sqlalchemy import engine_from_config
-from sqlalchemy import pool
+from flask import current_app
 
 from alembic import context
 
@@ -11,21 +11,33 @@ config = context.config
 
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
-if config.config_file_name is not None:
-    fileConfig(config.config_file_name)
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+
+def get_engine():
+    try:
+        # this works with Flask-SQLAlchemy<3 and Alchemical
+        return current_app.extensions['migrate'].db.get_engine()
+    except (TypeError, AttributeError):
+        # this works with Flask-SQLAlchemy>=3
+        return current_app.extensions['migrate'].db.engine
+
+
+def get_engine_url():
+    try:
+        return get_engine().url.render_as_string(hide_password=False).replace(
+            '%', '%%')
+    except AttributeError:
+        return str(get_engine().url).replace('%', '%%')
+
 
 # add your model's MetaData object here
 # for 'autogenerate' support
-import sys
-import os
-sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
-
-from app import create_app, db
-from app.models import User, Folder
-
-app = create_app()
-with app.app_context():
-    target_metadata = db.metadata
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option('sqlalchemy.url', get_engine_url())
+target_db = current_app.extensions['migrate'].db
 
 # other values from the config, defined by the needs of env.py,
 # can be acquired:
@@ -33,7 +45,13 @@ with app.app_context():
 # ... etc.
 
 
-def run_migrations_offline() -> None:
+def get_metadata():
+    if hasattr(target_db, 'metadatas'):
+        return target_db.metadatas[None]
+    return target_db.metadata
+
+
+def run_migrations_offline():
     """Run migrations in 'offline' mode.
 
     This configures the context with just a URL
@@ -47,34 +65,46 @@ def run_migrations_offline() -> None:
     """
     url = config.get_main_option("sqlalchemy.url")
     context.configure(
-        url=url,
-        target_metadata=target_metadata,
-        literal_binds=True,
-        dialect_opts={"paramstyle": "named"},
+        url=url, target_metadata=get_metadata(), literal_binds=True
     )
 
     with context.begin_transaction():
         context.run_migrations()
 
 
-def run_migrations_online() -> None:
+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.
 
     """
-    # Use the Flask app's database configuration
-    with app.app_context():
-        connectable = db.engine
 
-        with connectable.connect() as connection:
-            context.configure(
-                connection=connection, target_metadata=target_metadata
-            )
+    # 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.')
 
-            with context.begin_transaction():
-                context.run_migrations()
+    conf_args = current_app.extensions['migrate'].configure_args
+    if conf_args.get("process_revision_directives") is None:
+        conf_args["process_revision_directives"] = process_revision_directives
+
+    connectable = get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=get_metadata(),
+            **conf_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
 
 
 if context.is_offline_mode():

migrations/script.py.mako

@@ -5,24 +5,20 @@ Revises: ${down_revision | comma,n}
 Create Date: ${create_date}
 
 """
-from typing import Sequence, Union
-
 from alembic import op
 import sqlalchemy as sa
 ${imports if imports else ""}
 
 # revision identifiers, used by Alembic.
-revision: str = ${repr(up_revision)}
-down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
-branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
-depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
 
 
-def upgrade() -> None:
-    """Upgrade schema."""
+def upgrade():
     ${upgrades if upgrades else "pass"}
 
 
-def downgrade() -> None:
-    """Downgrade schema."""
+def downgrade():
     ${downgrades if downgrades else "pass"}

migrations/versions/02a7c13515a4_initial.py

@@ -1,28 +1,25 @@
-"""Initial migration with users and folders tables
+"""initial
 
-Revision ID: 1f23b4f802b0
+Revision ID: 02a7c13515a4
 Revises: 
-Create Date: 2025-08-03 08:30:06.300965
+Create Date: 2025-08-03 21:33:28.507003
 
 """
-from typing import Sequence, Union
-
 from alembic import op
 import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision: str = '1f23b4f802b0'
-down_revision: Union[str, Sequence[str], None] = None
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
+revision = '02a7c13515a4'
+down_revision = None
+branch_labels = None
+depends_on = None
 
 
-def upgrade() -> None:
-    """Upgrade schema."""
+def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
     op.create_table('users',
-    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
     sa.Column('email', sa.String(length=255), nullable=False),
     sa.Column('password_hash', sa.LargeBinary(), nullable=True),
     sa.Column('imap_config', sa.JSON(), nullable=True),
@@ -30,8 +27,8 @@ def upgrade() -> None:
     sa.UniqueConstraint('email')
     )
     op.create_table('folders',
-    sa.Column('id', sa.UUID(), nullable=False),
-    sa.Column('user_id', sa.UUID(), nullable=False),
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('user_id', sa.Integer(), nullable=False),
     sa.Column('name', sa.String(length=255), nullable=False),
     sa.Column('rule_text', sa.Text(), nullable=True),
     sa.Column('priority', sa.Integer(), nullable=True),
@@ -41,8 +38,7 @@ def upgrade() -> None:
     # ### end Alembic commands ###
 
 
-def downgrade() -> None:
-    """Downgrade schema."""
+def downgrade():
     # ### commands auto generated by Alembic - please adjust! ###
     op.drop_table('folders')
     op.drop_table('users')