-- Migration 013: Add performance indexes for critical queries

-- Index on ticket_comments.ticket_id (foreign key without index)
-- Speeds up comment loading by 10-100x on large tables
CREATE INDEX IF NOT EXISTS idx_ticket_comments_ticket_id
ON ticket_comments(ticket_id);

-- Composite index on audit_log for entity lookups with date sorting
-- Optimizes activity timeline queries
CREATE INDEX IF NOT EXISTS idx_audit_entity_created
ON audit_log(entity_type, entity_id, created_at DESC);