feat: add SQLite migration runner

tests/test_store/test_migrations.py

@@ -0,0 +1,42 @@
+from pathlib import Path
+
+import aiosqlite
+
+from fastapi_oidc_op.store.sqlite.migrations import run_migrations
+
+MIGRATIONS_DIR = (
+    Path(__file__).resolve().parent.parent.parent / "src" / "fastapi_oidc_op" / "store" / "sqlite" / "migrations"
+)
+
+
+async def test_run_migrations_applies_initial() -> None:
+    async with aiosqlite.connect(":memory:") as db:
+        await db.execute("PRAGMA foreign_keys=ON")
+        count = await run_migrations(db, MIGRATIONS_DIR)
+        assert count == 1
+        async with db.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='users'") as cursor:
+            row = await cursor.fetchone()
+        assert row is not None
+
+
+async def test_run_migrations_skips_already_applied() -> None:
+    async with aiosqlite.connect(":memory:") as db:
+        await db.execute("PRAGMA foreign_keys=ON")
+        first_count = await run_migrations(db, MIGRATIONS_DIR)
+        second_count = await run_migrations(db, MIGRATIONS_DIR)
+        assert first_count == 1
+        assert second_count == 0
+
+
+async def test_run_migrations_creates_all_tables() -> None:
+    async with aiosqlite.connect(":memory:") as db:
+        await db.execute("PRAGMA foreign_keys=ON")
+        await run_migrations(db, MIGRATIONS_DIR)
+        async with db.execute("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name") as cursor:
+            tables = [row[0] async for row in cursor]
+        assert "users" in tables
+        assert "user_groups" in tables
+        assert "webauthn_credentials" in tables
+        assert "password_credentials" in tables
+        assert "magic_links" in tables
+        assert "_migrations" in tables