feat: add prompt history management

ai_knowledge_base_v2/apps/backend/alembic/versions/0010_prompt_history_management.py

@@ -0,0 +1,29 @@
+"""add prompt history metadata and ordering index
+
+Revision ID: 0010_prompt_history_management
+Revises: 0009_logs_storage
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "0010_prompt_history_management"
+down_revision = "0009_logs_storage"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "sys_prompt",
+        sa.Column("change_type", sa.String(length=20), nullable=False, server_default="save"),
+    )
+    op.add_column("sys_prompt", sa.Column("source_prompt_id", sa.BigInteger(), nullable=True))
+    op.create_index("ix_sys_prompt_updated_at_id", "sys_prompt", ["updated_at", "id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_sys_prompt_updated_at_id", table_name="sys_prompt")
+    op.drop_column("sys_prompt", "source_prompt_id")
+    op.drop_column("sys_prompt", "change_type")