feat: chat_file table

backend/open_webui/migrations/versions/c440947495f3_add_chat_file_table.py

@@ -0,0 +1,57 @@
+"""Add chat_file table
+
+Revision ID: c440947495f3
+Revises: 81cc2ce44d79
+Create Date: 2025-12-21 20:27:41.694897
+
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = "c440947495f3"
+down_revision: Union[str, None] = "81cc2ce44d79"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "chat_file",
+        sa.Column("id", sa.Text(), primary_key=True),
+        sa.Column("user_id", sa.Text(), nullable=False),
+        sa.Column(
+            "chat_id",
+            sa.Text(),
+            sa.ForeignKey("chat.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "file_id",
+            sa.Text(),
+            sa.ForeignKey("file.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column("message_id", sa.Text(), nullable=True),
+        sa.Column("created_at", sa.BigInteger(), nullable=False),
+        sa.Column("updated_at", sa.BigInteger(), nullable=False),
+        # indexes
+        sa.Index("ix_chat_file_chat_id", "chat_id"),
+        sa.Index("ix_chat_file_file_id", "file_id"),
+        sa.Index("ix_chat_file_message_id", "message_id"),
+        sa.Index("ix_chat_file_user_id", "user_id"),
+        # unique constraints
+        sa.UniqueConstraint(
+            "chat_id", "file_id", name="uq_chat_file_chat_file"
+        ),  # prevent duplicate entries
+    )
+    pass
+
+
+def downgrade() -> None:
+    op.drop_table("chat_file")
+    pass