feat: add Alembic

This adds the `ratings_index` to code, which so far wasn't reflected in
SQLAlchemy's metadata.

alembic.ini

@@ -0,0 +1,39 @@
+[alembic]
+script_location = alembic
+file_template = %%(epoch)s-%%(rev)s_%%(slug)s
+timezone = UTC
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[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
+
+[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

alembic/env.py

@@ -0,0 +1,103 @@
+import asyncio
+from logging.config import fileConfig
+
+import sqlalchemy as sa
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+from unwind import db, models
+
+# 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.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+
+def is_different_type(
+    context,
+    inspected_column: sa.Column,
+    metadata_column: sa.Column,
+    inspected_type: sa.types.TypeEngine,
+    metadata_type: sa.types.TypeEngine,
+) -> bool | None:
+    # We used "TEXT" in our manual SQL, which in SQLite is the same as VARCHAR, but
+    # for SQLAlchemy/Alembic looks different.
+    equiv_types = [(sa.TEXT, sa.String)]
+    for types in equiv_types:
+        if isinstance(inspected_type, types) and isinstance(metadata_type, types):
+            return False
+    return None  # defer to default compare implementation
+
+
+def run_migrations_offline() -> None:
+    """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.
+
+    """
+    context.configure(
+        url=db._connection_uri(),
+        target_metadata=models.metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=is_different_type,
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(
+        connection=connection,
+        target_metadata=models.metadata,
+        compare_type=is_different_type,
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        url=db._connection_uri(),
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+def run_migrations_online_async() -> None:
+    """Run migrations in 'online' mode."""
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online_async()

alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: str | None = ${repr(down_revision)}
+branch_labels: str | Sequence[str] | None = ${repr(branch_labels)}
+depends_on: str | Sequence[str] | None = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "aiosqlite"
@@ -18,6 +18,25 @@ typing_extensions = ">=4.0"
 dev = ["attribution (==1.7.0)", "black (==24.2.0)", "coverage[toml] (==7.4.1)", "flake8 (==7.0.0)", "flake8-bugbear (==24.2.6)", "flit (==3.9.0)", "mypy (==1.8.0)", "ufmt (==2.3.0)", "usort (==1.0.8.post1)"]
 docs = ["sphinx (==7.2.6)", "sphinx-mdinclude (==0.5.3)"]
 
+[[package]]
+name = "alembic"
+version = "1.13.1"
+description = "A database migration tool for SQLAlchemy."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "alembic-1.13.1-py3-none-any.whl", hash = "sha256:2edcc97bed0bd3272611ce3a98d98279e9c209e7186e43e75bbb1b2bdfdbcc43"},
+    {file = "alembic-1.13.1.tar.gz", hash = "sha256:4932c8558bf68f2ee92b9bbcb8218671c627064d5b08939437af6d77dc05e595"},
+]
+
+[package.dependencies]
+Mako = "*"
+SQLAlchemy = ">=1.3.0"
+typing-extensions = ">=4"
+
+[package.extras]
+tz = ["backports.zoneinfo"]
+
 [[package]]
 name = "anyio"
 version = "4.3.0"
@@ -346,6 +365,94 @@ files = [
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 ]
 
+[[package]]
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+version = "1.3.5"
+description = "A super-fast templating language that borrows the best ideas from the existing templating languages."
+optional = false
+python-versions = ">=3.8"
+files = [
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+    {file = "Mako-1.3.5.tar.gz", hash = "sha256:48dbc20568c1d276a2698b36d968fa76161bf127194907ea6fc594fa81f943bc"},
+]
+
+[package.dependencies]
+MarkupSafe = ">=0.9.2"
+
+[package.extras]
+babel = ["Babel"]
+lingua = ["lingua"]
+testing = ["pytest"]
+
+[[package]]
+name = "markupsafe"
+version = "2.1.5"
+description = "Safely add untrusted strings to HTML/XML markup."
+optional = false
+python-versions = ">=3.7"
+files = [
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+]
+
 [[package]]
 name = "nodeenv"
 version = "1.8.0"
@@ -694,4 +801,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "038fed338d6b75c17eb8eb88d36c2411ff936dab23887b70594e5ba1da518451"
+content-hash = "9dbc732b312d6d39fbf4e8b8af22739aad6c25312cee92736f19d3a106f93129"

pyproject.toml

@@ -18,6 +18,7 @@ ulid-py = "^1.1.0"
 uvicorn = "^0.29.0"
 httpx = "^0.27.0"
 sqlalchemy = {version = "^2.0", extras = ["aiosqlite"]}
+alembic = "^1.13.1"
 
 [tool.poetry.group.build.dependencies]
 # When we run poetry export, typing-extensions is a transient dependency via

unwind/db.py

@@ -194,11 +194,13 @@ async def set_import_progress(conn: Connection, /, progress: float) -> Progress:
     return current
 
 
-def _new_engine() -> AsyncEngine:
+def _connection_uri() -> str:
-    uri = f"sqlite+aiosqlite:///{config.storage_path}"
+    return f"sqlite+aiosqlite:///{config.storage_path}"
 
+
+def _new_engine() -> AsyncEngine:
     return create_async_engine(
-        uri,
+        _connection_uri(),
         isolation_level="SERIALIZABLE",
     )
 

unwind/models.py

@@ -20,7 +20,7 @@ from typing import (
     get_origin,
 )
 
-from sqlalchemy import Column, ForeignKey, Integer, String, Table
+from sqlalchemy import Column, ForeignKey, Index, Integer, String, Table
 from sqlalchemy.orm import registry
 
 from .types import ULID
@@ -455,6 +455,7 @@ class Rating:
 
 
 ratings = Rating.__table__
+Index("ratings_index", ratings.c.movie_id, ratings.c.user_id, unique=True)
 
 
 class GroupUser(TypedDict):