51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
"""
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Copyright 2024-2026 ReplyPier
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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"""index chat_history on (session_id, created_at)
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Revision ID: add_chat_session_idx_001
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Revises: hc_img_paths_001
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Create Date: 2026-07-22
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chat_history had no index on session_id — only the primary key — so every lookup of
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a conversation's messages was a sequential scan. The columns match the ordering
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every reader now uses, (created_at, id), so the inbox previews and
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get_session_history are both answered from the index alone.
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"""
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from alembic import op
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import sqlalchemy as sa
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# revision identifiers, used by Alembic.
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revision = 'add_chat_session_idx_001'
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down_revision = 'hc_img_paths_001'
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branch_labels = None
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depends_on = None
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INDEX_NAME = 'ix_chat_history_session_created'
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def upgrade() -> None:
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op.create_index(
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INDEX_NAME,
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'chat_history',
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['session_id', sa.text('created_at DESC'), sa.text('id DESC')],
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unique=False,
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)
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def downgrade() -> None:
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op.drop_index(INDEX_NAME, table_name='chat_history')
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