Root cause: db::next_item_number scanned the visible CRDT index and the
content store but not the tombstone set, so it would hand out a numeric
ID whose CRDT entry had been tombstoned. crdt_state::write_item then
silently no-op'd the insert (tombstone-match guard) while the content
store and SQLite shadow happily accepted the row, producing a split-
brain half-write that was invisible to every CRDT-driven read path and
couldn't be cleaned up by delete_story / purge_story.
This change closes the loop:
- crdt_state::read::{is_tombstoned, tombstoned_ids} expose the
tombstone set so callers outside crdt_state can consult it.
- db::next_item_number now scans tombstoned_ids() too. The allocator
skips past tombstoned numeric IDs instead of treating their slots as
free.
- write_item logs a WARN when it rejects a write for a tombstoned ID
(was silent). The warn is a tripwire — if the allocator ever lets one
slip through again we'll see it in the log.
- create_item_in_backlog adds two defence-in-depth checks:
(a) before any write, reject if the allocator returned a
tombstoned ID;
(b) after the writes, call read_item to confirm the CRDT entry
materialised. If not, roll back the content-store + shadow-DB
rows via db::delete_item and return Err.
Regression tests cover the allocator skip, the is_tombstoned accessor,
and the create_item_in_backlog rollback path.
Out of scope for this commit:
- Recovery of the already-half-written items currently in the running
pipeline (989, 1000, 1001) — Stage 2/3 of the plan, handled
separately.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Timmy
c61f715878