111 lines
3.5 KiB
Python
111 lines
3.5 KiB
Python
"""sub-sections inside each vertical (e.g. Real Estate → Dubai / Moscow)
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A channel now belongs to exactly one section, and each section to exactly
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one vertical. The migration auto-creates a `Общий` section per vertical
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that has at least one channel and pins all existing channels there, so the
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service keeps working without manual reclassification after upgrade.
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Revision ID: 0008
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Revises: 0007
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Create Date: 2026-05-20
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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 = "0008"
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down_revision: Union[str, None] = "0007"
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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.create_table(
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"sections",
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sa.Column("id", sa.Integer(), primary_key=True),
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sa.Column("vertical", sa.String(length=32), nullable=False),
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sa.Column("slug", sa.String(length=64), nullable=False),
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sa.Column("title", sa.String(length=255), nullable=False),
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sa.Column("emoji", sa.String(length=8), nullable=True),
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sa.Column("description", sa.Text(), nullable=True),
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sa.Column(
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"created_at",
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sa.DateTime(timezone=True),
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nullable=False,
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server_default=sa.func.now(),
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),
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sa.UniqueConstraint("vertical", "slug", name="uq_section_vertical_slug"),
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)
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op.create_index("ix_sections_vertical", "sections", ["vertical"])
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# Auto-create a `default` section for each vertical that already has channels,
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# so the backfill below has somewhere to point.
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op.execute(
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"""
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INSERT INTO sections (vertical, slug, title, emoji)
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SELECT DISTINCT c.vertical,
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'default',
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CASE c.vertical
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WHEN 'hr' THEN 'Общий HR'
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ELSE 'Общий'
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END,
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CASE c.vertical WHEN 'hr' THEN '👥' ELSE '🏠' END
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FROM channels c
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ON CONFLICT (vertical, slug) DO NOTHING
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"""
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)
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# Add nullable section_id first so the backfill can populate it.
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op.add_column(
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"channels",
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sa.Column("section_id", sa.Integer(), nullable=True),
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)
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op.create_foreign_key(
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"fk_channels_section",
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"channels",
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"sections",
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["section_id"],
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["id"],
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ondelete="RESTRICT",
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)
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op.create_index("ix_channels_section_id", "channels", ["section_id"])
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op.execute(
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"""
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UPDATE channels c
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SET section_id = s.id
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FROM sections s
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WHERE s.vertical = c.vertical AND s.slug = 'default'
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"""
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)
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# Now we can safely require section_id.
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op.alter_column("channels", "section_id", nullable=False)
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# Per-section LLM prompt keys are longer than 64 chars
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# (`llm_system_prompt:real_estate:some-long-slug`), so widen the key column.
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op.alter_column(
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"app_settings",
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"key",
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existing_type=sa.String(length=64),
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type_=sa.String(length=128),
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existing_nullable=False,
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)
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def downgrade() -> None:
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op.alter_column(
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"app_settings",
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"key",
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existing_type=sa.String(length=128),
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type_=sa.String(length=64),
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existing_nullable=False,
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)
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op.drop_index("ix_channels_section_id", table_name="channels")
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op.drop_constraint("fk_channels_section", "channels", type_="foreignkey")
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op.drop_column("channels", "section_id")
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op.drop_index("ix_sections_vertical", table_name="sections")
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op.drop_table("sections")
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