[BeSovereign]

Refs #120

Db.createBackup now writes a consistent VACUUM INTO snapshot, checks it with integrity_check and renames it to webcalendar.db.backup with no raw-copy fallback, and a new worker (server/utils/dbBackup.js) writes it at production boot and then hourly, so the nightly shard backup always contains a whole copy. quiesceDatabase now fails when the checkpoint returns no result; this round changed no code because the earlier e2e failure did not recur (Playwright 76/76 twice, node 1768/1768), and the failing test name was not in the log, so the cause is unconfirmed.

Driver gates (measured, not claimed)

• Suites: lint: 1 passed, 0 failed | node: 1768 passed, 0 failed | python: 104 passed, 0 failed | e2e: 76 passed, 0 failed
• Red/green check on declared tests: server/test/issue120_consistent_backup_snapshot.test.js

red/green output

RED without the change:
acation_framework/worktrees/issue-120/server/test/issue120_consistent_backup_snapshot.test.js'
#   ]
# }
# Node.js v20.18.0
# Subtest: /home/agent-user/Coding/Freeshard/vacation_framework/worktrees/issue-120/server/test/issue120_consistent_backup_snapshot.test.js
not ok 1 - /home/agent-user/Coding/Freeshard/vacation_framework/worktrees/issue-120/server/test/issue120_consistent_backup_snapshot.test.js
  ---
  duration_ms: 55.018396
  location: '/home/agent-user/Coding/Freeshard/vacation_framework/worktrees/issue-120/server/test/issue120_consistent_backup_snapshot.test.js:1:1'
  failureType: 'testCodeFailure'
  exitCode: 1
  signal: ~
  error: 'test failed'
  code: 'ERR_TEST_FAILURE'
  ...
1..1
# tests 1
# suites 0
# pass 0
# fail 1
# cancelled 0
# skipped 0
# todo 0
# duration_ms 58.701088


GREEN with the change:
   ok 3 - each run replaces the previous snapshot with the current state
      ---
      duration_ms: 116.206905
      ...
    # Subtest: a stale temp file from an interrupted run does not block the next snapshot
    ok 4 - a stale temp file from an interrupted run does not block the next snapshot
      ---
      duration_ms: 45.98023
      ...
    1..4
ok 1 - Issue \#120 — consistent webcalendar.db.backup snapshot
  ---
  duration_ms: 853.228616
  type: 'suite'
  ...
# Subtest: the production server writes webcalendar.db.backup into its data directory at boot
ok 2 - the production server writes webcalendar.db.backup into its data directory at boot
  ---
  duration_ms: 915.675443
  ...
1..2
# tests 5
# suites 1
# pass 5
# fail 0
# cancelled 0
# skipped 0
# todo 0
# duration_ms 1840.385294

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