add go bench client

backend/migrations/020_update_uptime_seconds_float.sql

@@ -0,0 +1,15 @@
+-- Migration 020: Store uptime_seconds as REAL for fractional values
+-- Date: 2026-01-11
+-- Description: Change hardware_snapshots.uptime_seconds from INTEGER to REAL
+
+BEGIN TRANSACTION;
+
+ALTER TABLE hardware_snapshots ADD COLUMN uptime_seconds_real REAL;
+UPDATE hardware_snapshots
+SET uptime_seconds_real = uptime_seconds
+WHERE uptime_seconds IS NOT NULL;
+
+ALTER TABLE hardware_snapshots DROP COLUMN uptime_seconds;
+ALTER TABLE hardware_snapshots RENAME COLUMN uptime_seconds_real TO uptime_seconds;
+
+COMMIT;