fix/various fixes

api/alembic/versions/0001_initial_schema.py

@@ -0,0 +1,74 @@
+"""initial schema (squashed)
+
+单一迁移：pgvector + 当前全部 ORM 表（含 conversations.deleted_at 软删除）；并补充 models 未声明的
+story_image_intents.asset_id → assets 外键，以及每个 story 仅一条 primary intent 的唯一索引。
+chapters 含 story 物化字段：markdown_compose_dirty、markdown_composed_at（随 ORM 一并 create_all）。
+
+新库 / 删库重来：`alembic upgrade head`。
+
+Revision ID: 0001_initial
+Revises:
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+from sqlalchemy import text
+
+revision: str = "0001_initial"
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _import_all_models() -> None:
+    from app.features.asset import models as _asset_models  # noqa: F401
+    from app.features.auth import models as _auth_models  # noqa: F401
+    from app.features.conversation import models as _conv_models  # noqa: F401
+    from app.features.memory import models as _memory_models  # noqa: F401
+    from app.features.memoir import models as _memoir_models  # noqa: F401
+    from app.features.payment import models as _payment_models  # noqa: F401
+    from app.features.story import models as _story_models  # noqa: F401
+    from app.features.user import models as _user_models  # noqa: F401
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    conn.execute(text("CREATE EXTENSION IF NOT EXISTS vector"))
+
+    from app.core.db import Base
+
+    _import_all_models()
+    Base.metadata.create_all(bind=conn)
+
+    op.create_foreign_key(
+        "fk_story_image_intents_asset_id_assets",
+        "story_image_intents",
+        "assets",
+        ["asset_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+    op.execute(
+        """
+        CREATE UNIQUE INDEX IF NOT EXISTS uq_story_primary_image_intent
+        ON story_image_intents (story_id)
+        WHERE intent_role = 'primary'
+        """
+    )
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    from app.core.db import Base
+
+    op.execute("DROP INDEX IF EXISTS uq_story_primary_image_intent")
+    op.drop_constraint(
+        "fk_story_image_intents_asset_id_assets",
+        "story_image_intents",
+        type_="foreignkey",
+    )
+
+    _import_all_models()
+    Base.metadata.drop_all(bind=conn)
+    conn.execute(text("DROP EXTENSION IF EXISTS vector"))