34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
"""tasks.context_summary 列(§8.8 Phase 2 阈值结构化摘要).
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Revision ID: 0021
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Revises: 0020
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Create Date: 2026-07-09
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给 tasks 加 context_summary(TEXT NULL):窗口中段折叠后的结构化摘要。
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Session.load 时若非空,在 system 之后注入一条仅内存的「前情摘要」消息;
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与 context_base_idx(0019)配套 —— 折叠 = 摘要写这列 + base 推进到切点。
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原始消息仍全量留 messages 表(边界而非删除),web 端照旧翻完整历史。
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NULL = 从未折叠,行为与 0019 之前完全一致。additive,无数据迁移。
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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revision: str = "0021"
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down_revision: Union[str, None] = "0020"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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op.add_column(
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"tasks",
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sa.Column("context_summary", sa.Text(), nullable=True),
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)
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def downgrade() -> None:
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op.drop_column("tasks", "context_summary")
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