feat(post): add nullable description + attachment_count (migration 0007)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

alembic/versions/0007_fc2d_post_metadata_fields.py

@@ -0,0 +1,31 @@
+"""fc2d-iv: post.description + post.attachment_count
+
+Revision ID: 0007
+Revises: 0006
+Create Date: 2026-05-18
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0007"
+down_revision: Union[str, None] = "0006"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "post", sa.Column("description", sa.Text(), nullable=True)
+    )
+    op.add_column(
+        "post",
+        sa.Column("attachment_count", sa.Integer(), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("post", "attachment_count")
+    op.drop_column("post", "description")

backend/app/models/post.py

@@ -28,6 +28,9 @@ class Post(Base):
 
     raw_metadata: Mapped[dict | None] = mapped_column(JSON, nullable=True)
 
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    attachment_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
+
     downloaded_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), nullable=False, server_default=func.now()
     )

tests/test_migration_0007.py

@@ -0,0 +1,48 @@
+"""FC-2d-iv: post.description + post.attachment_count round-trip."""
+
+from datetime import UTC, datetime
+
+import pytest
+
+from backend.app.models import Artist, Post, Source
+
+pytestmark = pytest.mark.integration
+
+
+async def _post(db, **post_kwargs):
+    artist = Artist(name="Nadia", slug="nadia")
+    db.add(artist)
+    await db.flush()
+    src = Source(artist_id=artist.id, platform="web", url="http://x")
+    db.add(src)
+    await db.flush()
+    post = Post(
+        source_id=src.id, external_post_id="p1",
+        post_date=datetime(2026, 3, 1, tzinfo=UTC),
+        **post_kwargs,
+    )
+    db.add(post)
+    await db.flush()
+    return post.id
+
+
+def test_post_has_new_columns():
+    cols = {c.name for c in Post.__table__.columns}
+    assert "description" in cols
+    assert "attachment_count" in cols
+
+
+@pytest.mark.asyncio
+async def test_description_and_attachment_count_round_trip(db):
+    pid = await _post(db, description="<p>hi</p>", attachment_count=3)
+    row = await db.get(Post, pid)
+    assert row.description == "<p>hi</p>"
+    assert row.attachment_count == 3
+
+
+@pytest.mark.asyncio
+async def test_new_fields_default_null(db):
+    pid = await _post(db)
+    row = await db.get(Post, pid)
+    assert row.description is None
+    assert row.attachment_count is None