浅念
682249a3fd
该回未回决赛圈点查(owner+talker定位末条消息)在channel=None时无渠道 前缀条件,现有索引全以channel打头用不上,服务器100万行实测dashboard 34~37s撞前端15s超时(ECONNABORTED);补(owner,talker,timestamp)索引 后实测1.3~1.8s。服务器已先行手工建索引止血,本迁移幂等兜底对齐。 模型+迁移双声明防autogenerate反DROP
42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
"""message 补无渠道前缀索引 (owner_account_id, talker_id, timestamp)
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Revision ID: d8e9f0a1b2c3
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Revises: c9d0e1f2a3b4
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Create Date: 2026-09-10
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背景:该回未回决赛圈点查在 channel=None(管理驾驶舱 action_counts)时
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无渠道前缀条件,现有索引全部以 channel 打头用不上——服务器 100 万行
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实测 dashboard 34~37s 撞前端 15s 超时;索引落地后 1.3~1.8s。
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幂等:sa.inspect 先查,存在即跳过(服务器已先行手工建同名索引,本迁移
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兜底对齐 schema 版本)。「模型+迁移双声明」防 autogenerate 反 DROP。
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"""
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from collections.abc import Sequence
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import sqlalchemy as sa
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from alembic import op
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revision: str = "d8e9f0a1b2c3"
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down_revision: str | Sequence[str] | None = "c9d0e1f2a3b4"
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branch_labels: str | Sequence[str] | None = None
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depends_on: str | Sequence[str] | None = None
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_IDX = "ix_message_owner_talker_time"
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def _has_index(bind) -> bool:
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insp = sa.inspect(bind)
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if not insp.has_table("message"):
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return False
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return _IDX in {ix["name"] for ix in insp.get_indexes("message")}
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def upgrade() -> None:
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if not _has_index(op.get_bind()):
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op.create_index(_IDX, "message",
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["owner_account_id", "talker_id", "timestamp"])
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def downgrade() -> None:
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if _has_index(op.get_bind()):
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op.drop_index(_IDX, table_name="message")
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