60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
"""Create chat_sessions and messages tables.
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Revision ID: 004
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Revises: 003
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Create Date: 2025-02-05 15:30:00.000000
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"""
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from typing import Sequence, Union
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from alembic import op
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import sqlalchemy as sa
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from sqlalchemy.dialects import postgresql
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# revision identifiers, used by Alembic.
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revision: str = "004"
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down_revision: Union[str, None] = "003"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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from sqlalchemy import inspect
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conn = op.get_bind()
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inspector = inspect(conn)
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tables = inspector.get_table_names()
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if "chat_sessions" not in tables:
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op.create_table(
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"chat_sessions",
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sa.Column("id", sa.Integer(), nullable=False, autoincrement=True),
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sa.Column("external_user_id", sa.String(128), nullable=False),
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sa.Column("external_name", sa.String(128), nullable=True),
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sa.Column("status", sa.String(32), nullable=False, server_default="open"),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_index(op.f("ix_chat_sessions_external_user_id"), "chat_sessions", ["external_user_id"], unique=False)
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if "messages" not in tables:
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op.create_table(
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"messages",
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sa.Column("id", sa.Integer(), nullable=False, autoincrement=True),
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sa.Column("session_id", sa.Integer(), nullable=False),
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sa.Column("role", sa.String(16), nullable=False),
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sa.Column("content", sa.Text(), nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
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sa.ForeignKeyConstraint(["session_id"], ["chat_sessions.id"], ondelete="CASCADE"),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_index(op.f("ix_messages_session_id"), "messages", ["session_id"], unique=False)
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def downgrade() -> None:
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op.drop_index(op.f("ix_messages_session_id"), table_name="messages")
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op.drop_table("messages")
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op.drop_index(op.f("ix_chat_sessions_external_user_id"), table_name="chat_sessions")
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op.drop_table("chat_sessions")
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