feat: add sqlite persistence model
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gqt
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"""Create initial SQLite schema.
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Revision ID: 0001_initial
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Revises:
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Create Date: 2026-07-13
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"""
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from collections.abc import Sequence
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import sqlalchemy as sa
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from alembic import op
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revision: str = "0001_initial"
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down_revision: str | None = None
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branch_labels: str | Sequence[str] | None = None
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depends_on: str | Sequence[str] | None = None
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def upgrade() -> None:
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op.create_table(
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"documents",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column("filename", sa.Text(), nullable=False),
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sa.Column("stored_path", sa.Text(), nullable=False),
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sa.Column("file_type", sa.String(16), nullable=False),
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sa.Column("mime_type", sa.String(128), nullable=False),
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sa.Column("file_size", sa.Integer(), nullable=False),
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sa.Column("sha256", sa.String(64), nullable=False),
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sa.Column("status", sa.String(16), nullable=False),
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sa.Column("chunk_count", sa.Integer(), nullable=False),
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sa.Column("error_code", sa.String(64)),
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sa.Column("error_message", sa.Text()),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False),
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sa.CheckConstraint(
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"status IN ('pending','indexing','indexed','failed','deleting')",
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name="ck_documents_status",
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),
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)
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op.create_index("ix_documents_status_updated_at", "documents", ["status", "updated_at"])
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op.create_table(
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"chat_sessions",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column("title", sa.Text()),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False),
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)
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op.create_index("ix_chat_sessions_updated_at", "chat_sessions", ["updated_at"])
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op.create_table(
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"index_jobs",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column(
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"document_id",
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sa.String(36),
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sa.ForeignKey("documents.id", ondelete="CASCADE"),
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nullable=False,
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unique=True,
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),
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sa.Column("status", sa.String(16), nullable=False),
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sa.Column("attempt_count", sa.Integer(), nullable=False),
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sa.Column("last_error", sa.Text()),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.Column("started_at", sa.DateTime(timezone=True)),
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sa.Column("finished_at", sa.DateTime(timezone=True)),
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sa.CheckConstraint(
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"status IN ('queued','running','succeeded','failed')",
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name="ck_index_jobs_status",
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),
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)
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op.create_table(
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"chunks",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column(
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"document_id",
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sa.String(36),
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sa.ForeignKey("documents.id", ondelete="CASCADE"),
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nullable=False,
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),
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sa.Column("order_index", sa.Integer(), nullable=False),
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sa.Column("content", sa.Text(), nullable=False),
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sa.Column("page_number", sa.Integer()),
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sa.Column("char_count", sa.Integer(), nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.UniqueConstraint("document_id", "order_index", name="uq_chunks_document_order"),
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)
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op.create_index("ix_chunks_document_id", "chunks", ["document_id"])
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op.create_table(
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"messages",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column(
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"session_id",
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sa.String(36),
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sa.ForeignKey("chat_sessions.id", ondelete="CASCADE"),
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nullable=False,
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),
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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("status", sa.String(16), nullable=False),
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sa.Column("error_code", sa.String(64)),
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sa.Column("order_index", sa.Integer(), nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.CheckConstraint("role IN ('user','assistant')", name="ck_messages_role"),
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sa.CheckConstraint(
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"status IN ('generating','completed','failed')", name="ck_messages_status"
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),
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sa.UniqueConstraint("session_id", "order_index", name="uq_messages_session_order"),
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)
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op.create_index("ix_messages_session_created_at", "messages", ["session_id", "created_at"])
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op.create_table(
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"message_sources",
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sa.Column("id", sa.String(36), primary_key=True),
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sa.Column(
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"message_id",
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sa.String(36),
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sa.ForeignKey("messages.id", ondelete="CASCADE"),
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nullable=False,
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),
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sa.Column(
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"document_id",
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sa.String(36),
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sa.ForeignKey("documents.id", ondelete="CASCADE"),
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nullable=False,
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),
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sa.Column(
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"chunk_id",
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sa.String(36),
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sa.ForeignKey("chunks.id", ondelete="CASCADE"),
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nullable=False,
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),
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sa.Column("citation_label", sa.String(8), nullable=False),
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sa.Column("score", sa.Float(), nullable=False),
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sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
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sa.UniqueConstraint("message_id", "chunk_id", name="uq_message_sources_message_chunk"),
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)
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op.create_index("ix_message_sources_message_id", "message_sources", ["message_id"])
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def downgrade() -> None:
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op.drop_index("ix_message_sources_message_id", table_name="message_sources")
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op.drop_table("message_sources")
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op.drop_index("ix_messages_session_created_at", table_name="messages")
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op.drop_table("messages")
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op.drop_index("ix_chunks_document_id", table_name="chunks")
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op.drop_table("chunks")
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op.drop_table("index_jobs")
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op.drop_index("ix_chat_sessions_updated_at", table_name="chat_sessions")
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op.drop_table("chat_sessions")
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op.drop_index("ix_documents_status_updated_at", table_name="documents")
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op.drop_table("documents")
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