fix(phase26): server trip delete persists across recompute + batch delete with checkboxes

server/sql/migrate_phase26_deleted_trips.sql

@@ -0,0 +1,10 @@
+-- Migration: deleted trip markers to prevent recompute from re-inserting
+-- manually deleted trips. Each row records a trip the user explicitly
+-- removed. compute_trips_for_device() skips time ranges matching any marker.
+-- The "Recompute trips" button clears all markers before rebuilding.
+CREATE TABLE IF NOT EXISTS deleted_trip_markers (
+    device_id INTEGER NOT NULL REFERENCES devices(id) ON DELETE CASCADE,
+    start_time TIMESTAMPTZ NOT NULL,
+    deleted_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (device_id, start_time)
+);