feat: add initial Alembic configuration files for database migrations

alembic/env.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from logging.config import fileConfig
+from typing import Iterable
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+from config.database import Base, DATABASE_URL
+from models import *  # noqa: F401,F403 - ensure models are imported for metadata registration
+
+# this is the Alembic Config object, which provides access to the values within the .ini file.
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+config.set_main_option("sqlalchemy.url", DATABASE_URL)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode."""
+
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+def run_migrations() -> None:
+    if context.is_offline_mode():
+        run_migrations_offline()
+    else:
+        run_migrations_online()
+
+
+run_migrations()

alembic/script.py.mako

@@ -0,0 +1,17 @@
+"""${message}"""
+
+revision = ${repr(revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}