"""The unified post card — fold window, family window, and who linked a pair.

Milestone 388, #4402 and #4401. A Patreon teaser's card shows the Discord drop
it announced, and the rest of that piece's variants, by REFERENCE: nothing is
absorbed, nothing changes owner, and every Discord post keeps its own place.

Three columns:

* `import_settings.discord_link_fold_hours` — a linked drop leaves the feed
  only when it is this close to its teaser (the same release, shown twice).
* `import_settings.discord_family_window_days` — how far from the teaser the
  card reaches for variants. 60 is measured: named families spread up to 44
  days on artist 8, every collision found over 500.
* `post_association.linked_by` — "fc" or "operator", so a link FC made by
  itself can say so on the card and offer the undo the operator asked for.

Revision ID: 0110
Revises: 0109
Create Date: 2026-09-24

"""
import sqlalchemy as sa
from alembic import op

revision = "0110"
down_revision = "0109"
branch_labels = None
depends_on = None


def upgrade():
    op.add_column(
        "import_settings",
        sa.Column(
            "discord_link_fold_hours",
            sa.Float(),
            nullable=False,
            server_default=sa.text("24"),
        ),
    )
    op.add_column(
        "import_settings",
        sa.Column(
            "discord_family_window_days",
            sa.Float(),
            nullable=False,
            server_default=sa.text("60"),
        ),
    )
    op.add_column(
        "post_association",
        sa.Column("linked_by", sa.String(length=16), nullable=True),
    )


def downgrade():
    op.drop_column("post_association", "linked_by")
    op.drop_column("import_settings", "discord_family_window_days")
    op.drop_column("import_settings", "discord_link_fold_hours")