feat(time-tracking): timesheet workflow, manual entry, GPS, offline, payroll export (cycle 12)

Phase 2 of the time-tracking buildout — turns the existing clock widget
into a full payroll-ready system for Drivers / Supervisors / Admins.

Roles
- field_workers CHECK extended with 'driver' and 'supervisor' alongside
  the existing worker / time_admin / irrigator / water_admin values.

Schema (migration 0098)
- time_tracking_logs gains clock_in/out lat/lng/accuracy_m + gps_verified
  + entry_kind ('clock' | 'manual') + manual_reason + edit audit columns.
- new time_tracking_timesheets (draft → submitted → approved/locked →
  rejected, with unlock path for admins).
- new time_tracking_audit_log (append-only).
- new time_tracking_supervisor_assignments (supervisor ↔ supervisee edges).
- new SECURITY DEFINER RPCs: recompute_timesheet_totals(),
  get_or_create_timesheet(), plus a time_tracking_approval_queue view.

Workflow + locking (src/actions/time-tracking/timesheets.ts)
- resolveCaller() returns platform_admin / brand_admin / supervisor /
  worker context; supervisor scope is enforced via the assignments table.
- submitTimesheet / approveTimesheet / rejectTimesheet / unlockTimesheet
  all run inside withTx with FOR UPDATE row locks so the status + audit
  row + recompute RPC commit atomically.
- Editing or deleting an entry on an approved timesheet is blocked at
  the action layer; only unlockTimesheet (admin-only, mandatory audit
  note) can re-open it.

Manual entry (src/actions/time-tracking/entries.ts)
- addManualTimeEntry / editTimeEntry / deleteTimeEntry with Zod validation,
  audit-log writes in the same transaction, lock-aware.

GPS + offline (src/actions/time-tracking/field.ts,
  src/lib/offline/time-tracking-queue.ts,
  src/actions/time-tracking/offline-handlers.ts)
- captureGps() in the field client: best-effort geolocation, never blocks
  clock-in/out (gps_verified = accuracy_m <= 100).
- tryOrQueueClock() wraps the action; on network failure the event lands
  in IndexedDB and replays via replayOfflineClock() (PIN re-verified on
  replay, submitted_via = 'offline_sync').

Export (src/actions/time-tracking/export.ts +
  src/app/api/time-tracking/timesheets/[id]/export/route.ts)
- PDF (pdf-lib) + CSV (papaparse) payroll export with signature lines,
  available for any approved timesheet.

UI
- /admin/time-tracking with tab nav (Overview / Timesheets / Approvals /
  Audit).
- TimesheetsList, TimesheetDetail (status-driven workflow buttons,
  manual entry form, audit trail), ManualEntryForm.
- FleetRouteSummary on the time-tracking overview shows the full crew's
  water + time totals for the day.
- DailyRouteSummary on /admin/water-log/users/[id] shows the per-worker
  cross-link badge (water gallons + time hours + timesheet status).

Verification
- npx tsc --noEmit  → 0 errors.
- npm run build     → all 10 time-tracking routes compile.
- npm run lint      → 0 errors/warnings in new files.
- Playwright smoke  → 4/5 pass; the failing case is a pre-existing
  Tuxedo storefront 404 unrelated to this change.

db/schema/time-tracking.ts

@@ -12,6 +12,9 @@
  * `worker_id` column on the downstream tables
  * (`time_tracking_logs`, `time_tracking_notification_log`) was
  * renamed to `field_worker_id` and the FK repointed.
+ *
+ * Cycle 12 (Phase 2): GPS columns + manual entries + audit log +
+ * timesheet approval workflow (0098_time_tracking_timesheets.sql).
  */
 import {
   pgTable,
@@ -23,8 +26,10 @@ import {
   timestamp,
   index,
   jsonb,
+  date,
+  doublePrecision,
 } from "drizzle-orm/pg-core";
-import { brands } from "./brands";
+import { brands, adminUsers } from "./brands";
 import { fieldWorkers } from "./field-workers";
 
 export const timeTrackingSettings = pgTable(
@@ -115,6 +120,32 @@ export const timeTrackingLogs = pgTable(
     submittedVia: text("submitted_via", {
       enum: ["manual", "field", "import"],
     }).notNull().default("manual"),
+
+    // ── Migration 0098: GPS + manual entries + edit audit ────────
+    /** `'clock'` = from the field app, `'manual'` = admin-entered. */
+    entryKind: text("entry_kind", { enum: ["clock", "manual"] })
+      .notNull()
+      .default("clock"),
+    /** Required when `entry_kind = 'manual'`. Surfaced in payroll exports. */
+    manualReason: text("manual_reason"),
+    /** GPS columns — captured at clock-in / clock-out. Nullable: device
+     *  may have denied geolocation, in which case `gpsVerified = false`. */
+    clockInLat: doublePrecision("clock_in_lat"),
+    clockInLng: doublePrecision("clock_in_lng"),
+    clockInAccuracyM: doublePrecision("clock_in_accuracy_m"),
+    clockOutLat: doublePrecision("clock_out_lat"),
+    clockOutLng: doublePrecision("clock_out_lng"),
+    clockOutAccuracyM: doublePrecision("clock_out_accuracy_m"),
+    /** True iff the device supplied a fix with accuracy ≤ 100m. */
+    gpsVerified: boolean("gps_verified").notNull().default(false),
+    /** Edit audit — filled every time a server action updates the row
+     *  after creation. Never cleared. */
+    editedAt: timestamp("edited_at", { withTimezone: true }),
+    editedBy: uuid("edited_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    editReason: text("edit_reason"),
+
     createdAt: timestamp("created_at", { withTimezone: true })
       .notNull()
       .defaultNow(),
@@ -125,6 +156,11 @@ export const timeTrackingLogs = pgTable(
       t.fieldWorkerId,
     ),
     clockInIdx: index("time_tracking_logs_clock_in_idx").on(t.clockIn),
+    brandKindIdx: index("time_tracking_logs_brand_kind_idx").on(
+      t.brandId,
+      t.entryKind,
+      t.clockIn,
+    ),
   }),
 );
 
@@ -154,6 +190,164 @@ export const timeTrackingNotificationLog = pgTable(
   },
 );
 
+// ── Migration 0098: Timesheet + approval workflow ─────────────────────────
+
+export const TIMESHEET_STATUSES = [
+  "draft",
+  "submitted",
+  "approved",
+  "rejected",
+] as const;
+export type TimesheetStatus = (typeof TIMESHEET_STATUSES)[number];
+
+export const timeTrackingTimesheets = pgTable(
+  "time_tracking_timesheets",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    brandId: uuid("brand_id")
+      .notNull()
+      .references(() => brands.id, { onDelete: "cascade" }),
+    fieldWorkerId: uuid("field_worker_id")
+      .notNull()
+      .references(() => fieldWorkers.id, { onDelete: "cascade" }),
+    periodStart: date("period_start").notNull(),
+    periodEnd: date("period_end").notNull(),
+
+    status: text("status", { enum: TIMESHEET_STATUSES })
+      .notNull()
+      .default("draft"),
+
+    // Submission
+    submittedAt: timestamp("submitted_at", { withTimezone: true }),
+    submittedBy: uuid("submitted_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    submittedNotes: text("submitted_notes"),
+
+    // Approval (locks the timesheet)
+    reviewedAt: timestamp("reviewed_at", { withTimezone: true }),
+    reviewedBy: uuid("reviewed_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    reviewerComment: text("reviewer_comment"),
+
+    // Rejection
+    rejectedAt: timestamp("rejected_at", { withTimezone: true }),
+    rejectedBy: uuid("rejected_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    rejectionReason: text("rejection_reason"),
+
+    // Lock mirror (always equals reviewed_at when status=approved)
+    lockedAt: timestamp("locked_at", { withTimezone: true }),
+    lockedBy: uuid("locked_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+
+    // Unlock (rare, admin-only, MUST carry an audit note)
+    unlockedAt: timestamp("unlocked_at", { withTimezone: true }),
+    unlockedBy: uuid("unlocked_by").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    unlockAuditNote: text("unlock_audit_note").notNull().default(""),
+
+    // Pre-computed totals (recomputed by recompute_timesheet_totals RPC)
+    totalMinutes: integer("total_minutes").notNull().default(0),
+    regularMinutes: integer("regular_minutes").notNull().default(0),
+    overtimeMinutes: integer("overtime_minutes").notNull().default(0),
+    breakMinutes: integer("break_minutes").notNull().default(0),
+    entryCount: integer("entry_count").notNull().default(0),
+    /** Map of date string ("YYYY-MM-DD") → minutes worked that day. */
+    dailyTotals: jsonb("daily_totals").notNull().default({}),
+
+    createdAt: timestamp("created_at", { withTimezone: true })
+      .notNull()
+      .defaultNow(),
+    updatedAt: timestamp("updated_at", { withTimezone: true })
+      .notNull()
+      .defaultNow(),
+  },
+  (t) => ({
+    workerPeriodUniq: index(
+      "time_tracking_timesheets_worker_period_uniq",
+    ).on(t.fieldWorkerId, t.periodStart, t.periodEnd),
+    brandStatusIdx: index("time_tracking_timesheets_brand_status_idx").on(
+      t.brandId,
+      t.status,
+      t.periodStart,
+    ),
+    brandWorkerIdx: index("time_tracking_timesheets_brand_worker_idx").on(
+      t.brandId,
+      t.fieldWorkerId,
+    ),
+  }),
+);
+
+/** Append-only audit log — every mutating action on a timesheet or its
+ *  underlying logs MUST write a row here in the same DB transaction. */
+export const timeTrackingAuditLog = pgTable(
+  "time_tracking_audit_log",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    brandId: uuid("brand_id")
+      .notNull()
+      .references(() => brands.id, { onDelete: "cascade" }),
+    /** Admin user (or null when the actor was the worker themselves). */
+    actorId: uuid("actor_id").references(() => adminUsers.id, {
+      onDelete: "set null",
+    }),
+    actorLabel: text("actor_label").notNull(),
+    actorKind: text("actor_kind").notNull().default("admin"),
+    action: text("action").notNull(),
+    entityType: text("entity_type").notNull(),
+    entityId: uuid("entity_id"),
+    details: jsonb("details").notNull().default({}),
+    createdAt: timestamp("created_at", { withTimezone: true })
+      .notNull()
+      .defaultNow(),
+  },
+  (t) => ({
+    brandRecentIdx: index("time_tracking_audit_log_brand_recent_idx").on(
+      t.brandId,
+      t.createdAt,
+    ),
+    entityIdx: index("time_tracking_audit_log_entity_idx").on(
+      t.entityType,
+      t.entityId,
+    ),
+  }),
+);
+
+/** Supervisor ↔ supervisee edges. The brand admin assigns edges; the
+ *  approval queue filters by them. */
+export const timeTrackingSupervisorAssignments = pgTable(
+  "time_tracking_supervisor_assignments",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    brandId: uuid("brand_id")
+      .notNull()
+      .references(() => brands.id, { onDelete: "cascade" }),
+    supervisorFieldWorkerId: uuid("supervisor_field_worker_id")
+      .notNull()
+      .references(() => fieldWorkers.id, { onDelete: "cascade" }),
+    superviseeFieldWorkerId: uuid("supervisee_field_worker_id")
+      .notNull()
+      .references(() => fieldWorkers.id, { onDelete: "cascade" }),
+    createdAt: timestamp("created_at", { withTimezone: true })
+      .notNull()
+      .defaultNow(),
+  },
+  (t) => ({
+    uniq: index("time_tracking_supervisor_assignments_uniq").on(
+      t.supervisorFieldWorkerId,
+      t.superviseeFieldWorkerId,
+    ),
+    supervisorIdx: index(
+      "time_tracking_supervisor_assignments_supervisor_idx",
+    ).on(t.supervisorFieldWorkerId),
+  }),
+);
+
 export type TimeTrackingSettings = typeof timeTrackingSettings.$inferSelect;
 // Cycle 10: `TimeTrackingWorker` was removed. Use `FieldWorker` from
 // `./field-workers` instead; filter by role = 'worker' or 'time_admin'
@@ -162,6 +356,18 @@ export type TimeTrackingTask = typeof timeTrackingTasks.$inferSelect;
 export type TimeTrackingLog = typeof timeTrackingLogs.$inferSelect;
 export type TimeTrackingNotificationLog =
   typeof timeTrackingNotificationLog.$inferSelect;
+export type TimeTrackingTimesheet = typeof timeTrackingTimesheets.$inferSelect;
+export type TimeTrackingTimesheetInsert =
+  typeof timeTrackingTimesheets.$inferInsert;
+export type TimeTrackingAuditLogEntry =
+  typeof timeTrackingAuditLog.$inferSelect;
+export type TimeTrackingSupervisorAssignment =
+  typeof timeTrackingSupervisorAssignments.$inferSelect;
+
+// ── Inferred types ──
+
+// 0098 — daily totals JSON shape stored on the timesheet
+export type DailyTotals = Record<string, number>;
 
 // ── Smartsheet sync (Cycle 5) ──────────────────────────────────────────────