54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
from pathlib import Path
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from sqlalchemy import create_engine, text
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from sqlalchemy.orm import DeclarativeBase, sessionmaker
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from .config import settings
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Path(settings.database_path).parent.mkdir(parents=True, exist_ok=True)
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engine = create_engine(
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f"sqlite:///{settings.database_path}",
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connect_args={"check_same_thread": False},
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)
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SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
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class Base(DeclarativeBase):
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pass
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# Columns added to existing tables after their first release. create_all()
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# only creates missing *tables*, so an upgrade on an existing SQLite file
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# needs these added by hand — a lightweight alternative to a full migration
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# framework, appropriate for this project's scale. Add a new (table, column,
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# ddl-type-and-default) tuple here whenever a model gains a field.
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_COLUMN_MIGRATIONS = [
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("market_spikes", "top_keywords_json", "TEXT DEFAULT '[]'"),
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("market_spikes", "baseline_volatility_pct", "REAL"),
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]
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def _run_column_migrations() -> None:
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with engine.connect() as conn:
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for table, column, ddl in _COLUMN_MIGRATIONS:
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existing = {row[1] for row in conn.execute(text(f"PRAGMA table_info({table})"))}
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if column not in existing:
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conn.execute(text(f"ALTER TABLE {table} ADD COLUMN {column} {ddl}"))
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conn.commit()
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def init_db() -> None:
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from . import models # noqa: F401 (registers tables on Base.metadata)
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Base.metadata.create_all(bind=engine)
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_run_column_migrations()
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def get_session():
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session = SessionLocal()
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try:
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yield session
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finally:
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session.close()
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