Graham McIntire
d68f0f2e08
PostgreSQL requires functions in index predicates to be immutable. The NOW() function is not immutable, so we simplify the index to just order by received_at DESC without the WHERE clause. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
77 lines
2.8 KiB
Elixir
77 lines
2.8 KiB
Elixir
defmodule Aprsme.Repo.Migrations.OptimizePacketQueries do
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use Ecto.Migration
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@disable_ddl_transaction true
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@disable_migration_lock true
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def up do
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# Index for path pattern matching (used in heard_by queries)
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# Using btree with text_pattern_ops for LIKE queries since trigram might not be available
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_path_pattern
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ON packets(path text_pattern_ops)
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WHERE path IS NOT NULL AND path != ''
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"""
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# Composite index for base_callsign lookups with time
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_base_callsign_time
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ON packets(base_callsign, received_at DESC)
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WHERE base_callsign IS NOT NULL
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"""
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# Index for device_identifier lookups
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_device_identifier
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ON packets(device_identifier)
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WHERE device_identifier IS NOT NULL
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"""
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# Index for recent packets - using simple timestamp ordering
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# Note: We can't use NOW() in the WHERE clause as it's not immutable
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_recent_only
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ON packets(received_at DESC)
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"""
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# Index for weather packet lookups by callsign
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_weather_by_callsign
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ON packets(sender, received_at DESC)
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WHERE (temperature IS NOT NULL
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OR humidity IS NOT NULL
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OR pressure IS NOT NULL
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OR wind_speed IS NOT NULL
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OR wind_direction IS NOT NULL
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OR rain_1h IS NOT NULL)
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"""
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# Optimize existing indexes by updating statistics
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execute "ANALYZE packets"
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# Increase statistics target for frequently queried columns
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execute "ALTER TABLE packets ALTER COLUMN sender SET STATISTICS 1000"
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execute "ALTER TABLE packets ALTER COLUMN received_at SET STATISTICS 1000"
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execute "ALTER TABLE packets ALTER COLUMN base_callsign SET STATISTICS 500"
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# Create a compound index for the common "latest packet per callsign" query pattern
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execute """
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CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_packets_sender_id_desc
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ON packets(sender, id DESC)
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"""
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end
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def down do
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execute "DROP INDEX IF EXISTS idx_packets_path_pattern"
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execute "DROP INDEX IF EXISTS idx_packets_base_callsign_time"
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execute "DROP INDEX IF EXISTS idx_packets_device_identifier"
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execute "DROP INDEX IF EXISTS idx_packets_recent_only"
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execute "DROP INDEX IF EXISTS idx_packets_weather_by_callsign"
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execute "DROP INDEX IF EXISTS idx_packets_sender_id_desc"
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# Reset statistics to default
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execute "ALTER TABLE packets ALTER COLUMN sender SET STATISTICS DEFAULT"
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execute "ALTER TABLE packets ALTER COLUMN received_at SET STATISTICS DEFAULT"
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execute "ALTER TABLE packets ALTER COLUMN base_callsign SET STATISTICS DEFAULT"
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end
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end
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