perf: connection pooling, query consolidation, inline chart data, batch milestones

migrations/003_add_indexes.sql

@@ -0,0 +1,4 @@
+-- Migration 003: Add indexes for performance
+-- Partial index to speed up queries that filter on is_private = FALSE
+
+CREATE INDEX IF NOT EXISTS idx_users_public ON users(id) WHERE is_private = FALSE;