fix: Paket 0 – data integrity, security hardening and field usability

Backend
- Backup covers every Prisma model (bundle v3); a guard test fails for any
  new model that is neither backed up nor explicitly excluded. Unsealed
  bundles may only add rows to 27 legacy master/field tables and never
  overwrite; counters, ledgers, settings, roles etc. need a sealed file.
  Shared import limit BACKUP_MAX_IMPORT_BYTES (default 50 MB, max 256 MB)
  with warnings in log and UI; replaced document files are removed after
  commit.
- Post-commit side effects (automation, calendar sync, webhooks) run via
  runAfterCommit and never turn a committed write into a 500, so retries
  with the same Idempotency-Key no longer create duplicates.
- Calendar outbox is multi-replica safe: per-entry claims with stale
  takeover, revision-based settle, new Graph event only on 404/410,
  transactionId on create, 30 s Graph timeout, URL-encoded ids, GUID
  validation for groupId, "run now" in background and resets FAILED.
- Automation tasks are deduplicated under a row lock on the rule.
- Update DTOs follow one null rule: omitted = unchanged, null clears a
  nullable field, null on a required field is a 400.
- Varroa mites/day is recomputed on correction; withdrawal status is
  checked against the harvest date (?at=), bounded colonyIds; inspection
  create is audited; updates re-enqueue calendar entries.
- Dashboard, statistics and apiary/colony guards treat WEAK, CONSPICUOUS
  and QUEENLESS colonies as living.
- Prisma errors and body-parser errors are logged without query values or
  request bodies.
- Migration 20261012100000_calendar_sync_claims; schema index name aligned
  with the existing database object.

Frontend
- Sticky save bar sticks again (no scroll container ancestors, card uses
  overflow-clip), safe-area insets, scroll-padding, FAB hidden on forms,
  sticky desktop sidebar.
- Inspections record yes / no / not checked instead of silent defaults.
- All living colonies are selectable; shared RecordSelect, EnumSelect,
  ChoiceGroup and TriStateField replace per-page copies; selects show
  names instead of ids; labels point at real controls.
- Emptied optional fields are sent as null (emptyToNull) so every field
  can be cleared; dates default to the local day and are sent via
  toApiDate.
- Harvest withdrawal warning uses the harvest date; backup page warns when
  a backup outgrows the import limit and lists skipped tables.

Build and docs
- Docker builds fail unless lint, typecheck and unit tests pass.
- ARCHITECTURE.md updated (assumptions 9-12, 19-21, section 8) and spec
  docs/superpowers/specs/2026-10-12-plattform-rueckgrat-und-fahrplan-design.md
  for the backbone (api/worker/job roles, domain event outbox) and the
  feature roadmap T3-T7.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/calendar-sync/dto/update-calendar-sync-settings.dto.ts

@@ -1,48 +1,69 @@
 import { ApiPropertyOptional } from '@nestjs/swagger';
-import { IsBoolean, IsOptional, IsString, MaxLength } from 'class-validator';
+import {
+  IsBoolean,
+  IsOptional,
+  IsString,
+  Matches,
+  MaxLength,
+} from 'class-validator';
+import { IsOptionalNotNull } from '../../common/validation/is-optional-not-null';
 
+const GROUP_ID_PATTERN =
+  /^(?:[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})?$/i;
+
+// PATCH null rule: an omitted field stays unchanged. The switches are NOT
+// NULL columns, so null on them is a 400. groupId is nullable: null clears
+// it, and so does "" - the GUI's way of emptying the field.
 export class UpdateCalendarSyncSettingsDto {
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   enabled?: boolean;
 
   @ApiPropertyOptional({
+    type: String,
+    nullable: true,
     description:
-      'Objekt-ID der Microsoft-365-Gruppe. Leerer String löscht den GUI-Wert.',
+      'Objekt-ID der Microsoft-365-Gruppe. Leerer String oder null löscht den GUI-Wert.',
   })
   @IsOptional()
   @IsString()
   @MaxLength(100)
-  groupId?: string;
+  // An Entra object id (GUID) or "" - the value goes into the Graph URL
+  // path, so nothing else may get through.
+  @Matches(GROUP_ID_PATTERN, {
+    message:
+      'Gruppen-ID muss die Objekt-ID der Microsoft-365-Gruppe sein (Format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)',
+  })
+  groupId?: string | null;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncTask?: boolean;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncInspection?: boolean;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncTreatment?: boolean;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncFeeding?: boolean;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncHarvest?: boolean;
 
   @ApiPropertyOptional()
-  @IsOptional()
+  @IsOptionalNotNull()
   @IsBoolean()
   syncQueenAssignment?: boolean;
 }