0f3a267fb6
- alembic.ini: remove hardcoded sqlite URL - alembic/env.py: inject DATABASE_URL from container env - main.py: serialize Base.metadata.create_all() + setup_pgvector() behind a Postgres advisory lock (_run_startup_ddl). Previously all 4 uvicorn workers ran the DDL in parallel and occasionally deadlocked each other on ALTER TABLE ordering, killing one worker at startup. - CLAUDE.md: add Database migrations (Alembic) section DB was stamped at 9bac7bf02e38; no schema changes in this commit.
84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
import os
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config
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from sqlalchemy import pool
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from alembic import context
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Inject the live database URL from the app's environment so alembic talks to
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# the same Postgres as the running backend (alembic.ini no longer hardcodes it).
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_db_url = os.environ.get("DATABASE_URL")
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if _db_url:
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config.set_main_option("sqlalchemy.url", _db_url)
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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from app.models import User, PDFDocument, Section, Quiz, Question, QuizAttempt, AttemptAnswer, ReminderSchedule # noqa
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from app.database import Base
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target_metadata = Base.metadata
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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def run_migrations_offline() -> None:
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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"""Run migrations in 'online' mode.
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In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection, target_metadata=target_metadata
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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