feat(db): add 17 performance indexes for blackroad-saas

Optimizes query patterns for:
- Chat pagination (messages by channel/time)
- Auth/subscription checks
- Agent deployments and routing
- CRM deals, contacts, automations
- Task scheduling and sequences
- Billing and usage tracking

Database: blackroad-saas (c7bec6d8-42fa-49fb-9d8c-57d626dde6b9)
Size impact: +73KB (626KB → 700KB)

db/migrations/002_performance_indexes.sql

@@ -0,0 +1,55 @@
+-- BlackRoad SaaS Performance Indexes
+-- Database: blackroad-saas (c7bec6d8-42fa-49fb-9d8c-57d626dde6b9)
+-- Created: 2025-01-25
+-- Purpose: Optimize common query patterns for chat, CRM, agents, and billing
+
+-- 1. Chat pagination - channel messages sorted by time
+CREATE INDEX IF NOT EXISTS idx_messages_channel_time ON messages(channel_id, created_at DESC);
+
+-- 2. Auth checks - user subscription status
+CREATE INDEX IF NOT EXISTS idx_subscriptions_user_status ON subscriptions(user_id, status);
+
+-- 3. Dashboard - running agents per user
+CREATE INDEX IF NOT EXISTS idx_agent_deployments_user_status ON agent_deployments(user_id, status);
+
+-- 4. API key lookups - active keys only (partial index)
+CREATE INDEX IF NOT EXISTS idx_api_keys_user_active ON api_keys(user_id, revoked) WHERE revoked = 0;
+
+-- 5. CRM pipeline views - deals by contact and stage
+CREATE INDEX IF NOT EXISTS idx_crm_deals_contact_stage ON deals(contact_id, stage, value DESC);
+
+-- 6. Overdue task cron - pending tasks by deadline
+CREATE INDEX IF NOT EXISTS idx_tasks_deadline_pending ON tasks(deadline, status) WHERE status IN ('pending', 'assigned', 'in_progress');
+
+-- 7. Drip campaign automation - next action queue
+CREATE INDEX IF NOT EXISTS idx_sequence_enrollments_next_action ON sequence_enrollments(next_action_at, status) WHERE status = 'active';
+
+-- 8. Online agent routing - active agents by last seen
+CREATE INDEX IF NOT EXISTS idx_agents_status_last_seen ON agents(status, last_seen DESC) WHERE status != 'offline';
+
+-- 9. Stale presence cleanup - online users by last seen
+CREATE INDEX IF NOT EXISTS idx_presence_last_seen ON presence(last_seen DESC) WHERE status = 'online';
+
+-- 10. CRM automation matching - active triggers by type
+CREATE INDEX IF NOT EXISTS idx_automations_active_trigger ON automations(trigger_type, active) WHERE active = 1;
+
+-- 11. Agent memory retrieval - by type and importance
+CREATE INDEX IF NOT EXISTS idx_agent_memories_recall ON agent_memories(agent_id, memory_type, importance DESC, last_accessed DESC);
+
+-- 12. Billing dashboards - active instances by cost
+CREATE INDEX IF NOT EXISTS idx_instances_active_cost ON instances(user_id, status, cost_incurred DESC) WHERE status = 'active';
+
+-- 13. Agent activity logs - usage by agent and time
+CREATE INDEX IF NOT EXISTS idx_tool_usage_agent_time_cost ON tool_usage(agent_id, timestamp DESC, cost DESC);
+
+-- 14. Account-based selling - contacts by company and score
+CREATE INDEX IF NOT EXISTS idx_contacts_company_score ON contacts(company_id, lead_score DESC) WHERE company_id IS NOT NULL;
+
+-- 15. Channel discovery - by type and creation date
+CREATE INDEX IF NOT EXISTS idx_channels_type_created ON channels(type, created_at DESC);
+
+-- 16. Multi-agent routing - relationships by trust score
+CREATE INDEX IF NOT EXISTS idx_agent_relationships_trust ON agent_relationships(agent_id, trust_score DESC, successful_collaborations DESC);
+
+-- 17. Open pipeline views - deals by stage and value (excluding won/lost)
+CREATE INDEX IF NOT EXISTS idx_deals_stage_value ON deals(stage, value DESC) WHERE won IS NULL;