浅念
00ae13b5c2
- migrate_sqlite_to_mysql.py: 逐表清空重导(幂等),复用repos强转,JSON列 解析,67万消息按msg_id键集分批,467s跑完14表全一致 - 修4个MySQL实测bug: NULLS LAST语法(compat.py编译补丁)、message.text TEXT→MEDIUMTEXT(64KB字节上限,实测20.8万字符车源清单)、URL列 String(1024)→Text(分享链接超1KB)、垃圾超长member_id源头清理 - compose: media改bind mount(不占C盘Docker虚拟磁盘,实测2.5GB卷把 C盘撑爆引擎500);mysql不映射宿主机3306 - 前端Dockerfile: npm ci→install(本地/容器npm版本锁漂移) - 五服务实测:nginx→backend→MySQL全链路返回真实数据(客户6859/A**杰25条 /搜索56条),媒体49536文件bind mount直读 Co-Authored-By: Claude <noreply@anthropic.com>
56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
"""Database core: declarative base, async engine, session factory.
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Production targets MySQL via `asyncmy` (configured by `Settings.db_url`).
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Unit tests build their own in-memory SQLite engines (see `tests/test_db_base.py`)
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and only import `Base` / `async_session_maker` from here.
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"""
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from collections.abc import AsyncIterator
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from sqlalchemy.ext.asyncio import (
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from app.config import get_settings
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from app.db import compat # noqa: F401,I100 — 注册 MySQL NULLS LAST 编译补丁(导入即生效)
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class Base(DeclarativeBase):
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"""Common declarative base for all ORM models in the project."""
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settings = get_settings()
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# SQLite: 写锁竞争时忙等 60s 而不是立刻报 "database is locked"
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# （多进程并发写的场景：页面抓取器 × 2 + 后端 API 同时跑，2026-08-19 实测撞锁崩任务）。
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_connect_args = {"timeout": 60} if settings.db_url.startswith("sqlite") else {}
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async_engine = create_async_engine(
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settings.db_url,
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pool_pre_ping=True,
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pool_recycle=3600, # recycle connections before MySQL wait_timeout (default 8h) closes them
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connect_args=_connect_args,
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future=True,
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)
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async_session_maker: async_sessionmaker[AsyncSession] = async_sessionmaker(
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async_engine,
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expire_on_commit=False,
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)
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async def get_session() -> AsyncIterator[AsyncSession]:
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"""FastAPI dependency that yields an `AsyncSession`.
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Usage::
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@app.get("/")
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async def index(session: AsyncSession = Depends(get_session)):
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...
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"""
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async with async_session_maker() as session:
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yield session
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