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32 lines
726 B
Python
32 lines
726 B
Python
"""add index
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Revision ID: 8f43500ee275
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Revises: da42808081e3
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Create Date: 2025-02-24 17:35:33.072714
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"""
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from alembic import op
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# revision identifiers, used by Alembic.
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revision = "8f43500ee275"
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down_revision = "da42808081e3"
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branch_labels = None
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depends_on = None
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def upgrade() -> None:
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# Create a basic index on the lowercase message column for direct text matching
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# Limit to 2000 characters to stay well under the 8191 byte limit
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op.execute(
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"""
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CREATE INDEX idx_chat_message_message_lower
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ON chat_message (LOWER(substring(message, 1, 2000)))
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"""
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)
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def downgrade() -> None:
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# Drop the index
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op.execute("DROP INDEX IF EXISTS idx_chat_message_message_lower;")
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