83 lines
3.7 KiB
Python
83 lines
3.7 KiB
Python
"""add conversation sessions table
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Revision ID: add_conversation_sessions_table
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Revises: add_kb_chunk_ivfflat_index
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Create Date: 2026-03-11
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"""
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from __future__ import annotations
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from alembic import op
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import sqlalchemy as sa
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revision = "add_conversation_sessions_table"
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down_revision = "add_kb_chunk_ivfflat_index"
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branch_labels = None
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depends_on = None
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def _table_exists(bind, table_name: str) -> bool:
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return sa.inspect(bind).has_table(table_name)
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def _index_exists(bind, table_name: str, index_name: str) -> bool:
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inspector = sa.inspect(bind)
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if not inspector.has_table(table_name):
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return False
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return any(idx.get("name") == index_name for idx in inspector.get_indexes(table_name))
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def _create_index_if_missing(bind, table_name: str, index_name: str, columns: list[str], *, unique: bool = False) -> None:
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if not _index_exists(bind, table_name, index_name):
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op.create_index(index_name, table_name, columns, unique=unique)
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def _drop_index_if_exists(bind, table_name: str, index_name: str) -> None:
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if _index_exists(bind, table_name, index_name):
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op.drop_index(index_name, table_name=table_name)
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def upgrade() -> None:
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bind = op.get_bind()
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if not _table_exists(bind, "conversation_sessions"):
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op.create_table(
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"conversation_sessions",
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sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
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sa.Column("tenant_id", sa.BigInteger(), nullable=False, server_default="1"),
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sa.Column("sender", sa.String(length=128), nullable=False),
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sa.Column("current_project_id", sa.BigInteger(), sa.ForeignKey("projects.id"), nullable=True),
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sa.Column("last_intent", sa.String(length=64), nullable=True),
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sa.Column("last_message_text", sa.String(length=200), nullable=True),
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sa.Column("last_active_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
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sa.Column("created_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
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sa.Column("updated_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now(), onupdate=sa.func.now()),
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sa.UniqueConstraint("tenant_id", "sender", name="uq_conversation_sessions_tenant_sender"),
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)
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_create_index_if_missing(bind, "conversation_sessions", "ix_conversation_sessions_tenant_id", ["tenant_id"])
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_create_index_if_missing(bind, "conversation_sessions", "ix_conversation_sessions_sender", ["sender"])
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_create_index_if_missing(bind, "conversation_sessions", "ix_conversation_sessions_current_project_id", ["current_project_id"])
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_create_index_if_missing(bind, "conversation_sessions", "ix_conversation_sessions_last_intent", ["last_intent"])
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_create_index_if_missing(bind, "conversation_sessions", "ix_conversation_sessions_last_active_at", ["last_active_at"])
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_create_index_if_missing(
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bind,
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"conversation_sessions",
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"ix_conversation_sessions_tenant_sender_last_active",
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["tenant_id", "sender", "last_active_at"],
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)
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def downgrade() -> None:
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bind = op.get_bind()
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if not _table_exists(bind, "conversation_sessions"):
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return
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_tenant_sender_last_active")
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_last_active_at")
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_last_intent")
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_current_project_id")
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_sender")
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_drop_index_if_exists(bind, "conversation_sessions", "ix_conversation_sessions_tenant_id")
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op.drop_table("conversation_sessions")
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