feat(db): enforce unique listed channel names with an index by loganj · Pull Request #8787 · block/buzz

loganj · 2026-10-30T19:09:24Z

Summary

Stacked on #8782 (merged), which makes the relay refuse a second open channel with a name that another channel in the community already has. That check lives in relay code, so an older relay, a direct database write or a missed code path can still create a duplicate.

This PR adds the same rule to the database: a unique index on channel name, ignoring case, for the channels that show in the channel list. With the index in place, a duplicate fails at the write, whatever wrote it. The relay's own name check from #8782 is no longer needed, so this PR removes it. Clients still get the same refusal, invalid: an open channel named "…" already exists.

The migration builds the index itself, also on a populated channels table, so an auto-migrating relay upgrades with no operator index step (the rule from #8802). It still refuses to run while duplicate names remain, because the index cannot exist over them. docs/channel-name-uniqueness-deployment.md gives the full rollout.

Details

The index (migration 0083_channels_listed_name_unique.sql):

CREATE UNIQUE INDEX idx_channels_listed_name
    ON public.channels (community_id, lower(name))
    WHERE visibility = 'open' AND NOT unlisted
      AND channel_type IN ('stream', 'forum') AND deleted_at IS NULL;

It covers open, not unlisted streams and forums that are not deleted, archived ones included. Private channels, DMs and unlisted channels may still repeat names.

The migration builds the index inline, as 0049 does. When to_regclass finds no index, it runs a plain CREATE UNIQUE INDEX under lock_timeout 1s and statement_timeout 5s. On a busy or very large table it fails on those budgets, records nothing, and the relay retries at its next start. When the index already exists (a concurrent prebuild), it skips CREATE so it never requests the write-blocking lock. In both cases it then checks that the index is valid, ready and has the exact expected definition.
One refusal stays: duplicate names. The migration refuses to run while listed duplicates remain, and its error names the rename script. The renames must go through the relay so clients get the new kind:39000, and a migration must not change rows (docs/database.md Rule 3). This is the "fails closed until its repair has run" case in migrations/AGENTS.md, so the writer release from fix(relay): refuse a second listed open channel with the same name #8782 and the rename are a required stop.
Relay. A write that takes the name of a concurrent, uncommitted write waits for it, and fails if that write commits. So the post-write check and the per-name lock from fix(relay): refuse a second listed open channel with the same name #8782 are removed. The store already maps the index violation to the same "name taken" error.
Desired-state schema. schema/tables/public/channels.sql has the same index, and the schema parity test compares its live shape between the desired-state schema and the migrations.
Rollout (docs/channel-name-uniqueness-deployment.md), in order:
1. Deploy fix(relay): refuse a second listed open channel with the same name #8782 and wait until no older relay pod serves.
2. Rename the existing duplicates in each community with that PR's script, while relays keep serving. The script needs psql and python3, and the operator key must be a member of each community. The doc covers archived communities and communities being deleted.
3. Confirm that no duplicate remains.
4. Only for a deployment that migrates out of band and is too large for the budgets: build the index with CREATE UNIQUE INDEX CONCURRENTLY and verify it.
5. Deploy this release. With auto-migration on, the relay applies 0083 at startup. With it off, run buzz-admin migrate first, never the file through psql.
Rollback goes to the fix(relay): refuse a second listed open channel with the same name #8782 release only. Keep the index, and keep auto-migration off.
Test fixtures. Tests that inserted two open channels with one name now use distinct names. Tests that migrate a populated database through 0083 no longer prebuild the index.

Related issue

None found. Follows #8782.

Testing

Migration tests (listed_channel_name_postgres_tests.rs) start from a database migrated through 0082:
- With duplicates, 0083 fails and changes nothing.
- After the rename plan is applied, a channel writer that holds its lock makes the inline build fail on the 1s lock budget, with nothing recorded.
- With no writer, the populated table migrates with no prebuild, and a raw duplicate insert fails on the index.
- An index with a different definition, and an invalid one, are refused. A valid prebuilt index is accepted, and not replaced, while another transaction is writing to channels.
The store and relay name tests from fix(relay): refuse a second listed open channel with the same name #8782 pass with the relay check removed: the index refuses the duplicate, and the client still gets invalid:.
The rename plan and script tests from fix(relay): refuse a second listed open channel with the same name #8782 run on a database at 0082, the state the script runs in.
Local Postgres runs on 108737dc0, one fresh database per test as the nextest wrapper does: 38 of 40 buzz-db migration-lane tests pass (both listed-name tests, the migration parity test, the thread-window and invite-upgrade tests that migrate populated databases through 0083). The 2 event_follow_up contract tests fail locally the same way on main. All 49 buzz-db channel and channel-member store tests pass.

Database review checklist

Phase: contract. Before it: fix(relay): refuse a second listed open channel with the same name #8782 (writer release, required stop) and its rename script. Nothing after it.
No trigger, function, procedure, rule or foreign key.
No migration mutates rows. The renames happen before it, through the relay, with the script in fix(relay): refuse a second listed open channel with the same name #8782.
Never refuses a table because it has rows. Fails closed only with duplicates (repair not run) or with an invalid or different index; then 0083 raises and the relay does not start. The release notes must name the release that contains fix(relay): refuse a second listed open channel with the same name #8782 as a required stop.
Rule 4: migrations/, schema/tables/public/channels.sql and the parity test. A live catalog comparison covers the index.
Deployed relay: the fix(relay): refuse a second listed open channel with the same name #8782 relay answers invalid: beside the index (its tests pass with the index present). A relay older than that still writes, but gets a database error, not invalid:, for a duplicate. That is why fix(relay): refuse a second listed open channel with the same name #8782 is a required stop.
Timeouts and index build: lock_timeout 1s, statement_timeout 5s. The migration builds the index inline (plain CREATE UNIQUE INDEX, skipped when to_regclass finds a prebuilt one). Only out-of-band deployments too large for the budgets prebuild it with CREATE UNIQUE INDEX CONCURRENTLY (doc step 4).

🤖 Generated with Claude Code

salman1993

🤖 Approved on Salman's behalf by his AI agent.

Follow-up review of 8b9f7917a44784df75b22139c34765963b3a233d: no remaining findings or blockers from this review.

This head includes #8782's archived-rename fix and the Windows test guard. The index, migration and deployment document are unchanged from my earlier review. I inspected the current CI logs: all 1,291 PostgreSQL-lane tests passed on the PR merge ref containing this head, including both listed-name migration tests, the script test, and the archived operator-rename regression. Windows and unit checks also pass. Independently reran the 16 group-state relay tests on the exact upstream writer head; all passed. No separate local relay/app run was performed for this contract head.

Minimalism 9/10, elegance 9/10, correctness 9/10. This supersedes my earlier hold recommendation. Deploy only after the writer release is fully rolled out, duplicate cleanup validates to zero rows, and the unique index has been prebuilt concurrently and verified; apply 0079 before the contract relay serves traffic.

loganj · 2026-11-02T16:21:35Z

🤖 Agent run of the full rollout on a local relay, with relay membership required and a fresh database. Writer release: #8782 at 0df245e. Contract release: this PR at 603ccad.

The writer relay migrated to 0080. Four channels were seeded with raw SQL, as an older relay could have written them: open ops, open OPS, archived Ops and private ops. The writer relay refused a new oPs with invalid: an open channel named "oPs" already exists.
buzz-admin migrate from this PR, before the renames: 0081 failed with listed channels with duplicate names remain; run scripts/maintenance/rename_duplicate_listed_channel_names.sh …. The ledger stayed at 80, and no index was created.
The rename script ran with the relay serving. --dry-run listed 2 renames. The real run renamed OPS → OPS-22222222 and the archived Ops → Ops-33333333, and exited 0. A second run renamed nothing. The private ops kept its name.
The step 3 duplicate query returned zero rows.
buzz-admin migrate without the prebuilt index: 0081 failed with prebuild idx_channels_listed_name concurrently …, and the ledger stayed at 80.
CREATE UNIQUE INDEX CONCURRENTLY from step 4. The index was valid, ready and live, with exactly the definition the doc gives. The writer relay beside the index still answered invalid: for a duplicate.
buzz-admin migrate: 0081 applied, and the ledger is at 81.
The contract relay from this PR served:
- A duplicate open OPS was refused with invalid:.
- A private OPS was accepted.
- A new open forum was accepted, and renaming it to OPS was refused with invalid:.
- A raw SQL insert of an open Ops failed on idx_channels_listed_name.

…8782) ## Summary Two open channels in one community could have the same name, so the channel list showed two `#square-ios` rows and people could not tell them apart. Now the relay refuses to create, rename or open up a channel when that would give it the same name as another channel in the channel list, ignoring case. The client gets `invalid: an open channel named "…" already exists`. The rule follows Slack: an archived channel keeps its name until it is deleted. Private channels, DMs and unlisted channels may still repeat names. So a refusal never reveals that a private channel exists. The PR also adds a script that renames the duplicates that exist today. It sends each rename through the relay, so relays keep serving while it runs. The stacked PR #8787 then adds a database index that enforces the rule. This PR is the release that must be fully deployed before that index. ## Details **Which channels the rule covers.** A *listed* channel: open, not unlisted, a stream or forum, not deleted. Archived channels are included. The check runs on create, rename, private → open and unlisted → listed. **Relay check** (`crates/buzz-db/src/store/channel.rs`, `crates/buzz-relay/src/handlers/ingest.rs`): - The check runs after the write, in the same transaction, under a per-name lock. So two concurrent writers cannot both commit the same name. - A refused create or edit (kind:9007 or kind:9002) gets `OK false "invalid: an open channel named … already exists"`. Nothing from it is stored. - The relay gives the same answer when the database index from #8787 refuses the write. That covers the rollout, and a rollback from that release. - A channel create with no `h` tag (the new channel's id) is now refused before it is stored. Before, such a create ran after the event was stored, so a refusal (for example, a taken name) still answered "accepted". All first-party clients send `h`. **Operator rename** (`crates/buzz-relay/src/handlers/side_effects.rs`). The rename script needs to rename channels it does not own, archived ones included. So a relay operator may now send a channel edit that changes only the name of a listed channel. Everything else still needs the channel's owner or admin. - "Operator" means `RELAY_OPERATOR_PUBKEYS`, the owner fallback, or an `operator` row in `relay_operators`. A moderator is not an operator. - The rename also applies to an archived listed channel, whatever the operator's role in that channel, and the channel stays archived. Other edits of an archived channel are still refused. - Private channels, unlisted channels and DMs still need the channel's owner or admin. The relay decides "listed" under the channel row lock, so a channel made private during the rename is not renamed. - The rename takes the normal edit path: the name check, the stored event, the channel metadata event and fan-out. **Rename script** (`scripts/maintenance/rename_duplicate_listed_channel_names.sh`, with the read-only plan `plan_duplicate_listed_channel_renames.sql`): - In each group of listed channels that share a name, the oldest unarchived channel keeps the name. Each other channel becomes `<name>-<first 8 chars of id>`, or `<name>-<id>` when that is also taken. When all the channels in a group are archived, the oldest keeps the name. - **Starter channels.** Released desktop and mobile apps create `#general` and `#welcome-everyone` when a community has no open, unarchived stream with that name. Under the new rule, the relay refuses that create while an archived channel has the name, and the apps' setup fails. So the script also renames `general` and `welcome-everyone` when every listed channel with that name is archived. That frees the name for the apps. - The apps create each starter at a fixed id, derived from the relay's address. If a channel already has that id, the relay refuses the create there whatever its name, so a rename cannot help. For that name the script renames nothing, and an archived starter at its id keeps the name. The script computes the ids from `BUZZ_RELAY_URL` (or `BUZZ_STARTER_ORIGIN` when the apps use a different address) and prints them, so the operator can check them against a client. A relay-side fix for those clients is planned separately. - The operator key goes in `BUZZ_PRIVATE_KEY`. It must be a relay operator and a member of the community. The script stops at the first auth refusal and says so. - The script stops before the plan for an unknown host, an archived community and a community being deleted, and says what to do. - A failed rename (the new name is now taken, or the relay can't be reached) is reported, and the script goes on. At the end it reads the plan again and exits 1 if any rename remains. `--dry-run` prints the plan. - The script replaces the earlier direct-SQL repair and `buzz-admin reconcile-channels --metadata`, which needed every relay pod stopped. **Duplicates that exist today** (read on 2026-10-30): `ml-platform-public` (`d41a31f8…`, `7be55f5a…`) and `square-ios` (`79f8e9d4…` archived, `fe246d3e…` live). ### Rollout The full procedure, with exact SQL and recovery steps, is in `docs/channel-name-uniqueness-deployment.md` in #8787. 1. **Deploy this PR.** Wait until no older relay pod serves; check the image of every pod. An older relay can still create a duplicate, and it refuses the operator rename. 2. **Rename the existing duplicates in each community**, with relays serving. The key must be an `operator`, not a moderator, and a member of the community (`RELAY_URL=wss://<host> buzz-admin add-member --pubkey <npub>`). ```sh DATABASE_URL=postgres://... BUZZ_PRIVATE_KEY=<operator key> \ scripts/maintenance/rename_duplicate_listed_channel_names.sh --dry-run <community host> # review the plan, then run it again without --dry-run ``` For the duplicates known today, the newer `ml-platform-public` and the archived `square-ios` (`79f8e9d4…`) get the `-<id8>` suffix. 3. **Confirm that no duplicate remains** in any community (query in the doc). 4. **Build the index, then deploy #8787 Rollback from #8787 goes to this release only, keeping the index, with auto-migration off. ### Related issue None found. ### Testing - **Live local relay.** The script ran against a local relay built at 9ee09a6, with relay membership required and six seeded channels (`ops`, `OPS`, an archived `Ops`, a private `ops`, `dev`, `DEV`): - `--dry-run` listed the three renames. - With the operator key not yet a member, the script stopped at the first refusal, named the membership precondition and renamed nothing. - After `buzz-admin add-member`, it renamed all three and exited 0. The archived channel stayed archived, the private `ops` kept its name, and a second run renamed nothing. - With the community archived, the script stopped with the unarchive message. - Rerun at 0df245e as part of the full rollout in #8787: the relay refused a new duplicate over the wire, and the script renamed the seeded duplicates with the relay serving. - **Relay tests** (`group_state_postgres_tests.rs`): a taken name is refused as `invalid:` and nothing is stored; a create with no `h` tag is refused before it is stored; an operator can rename only a listed channel, only the name, archived or not, and a moderator cannot; an operator rename is refused if the channel stops being listed before it is saved. - **Store tests** (`channel_name_postgres_tests.rs`): create, rename, private → open and unlisted → listed are refused for a taken name; private and unlisted names may repeat; an archived channel keeps its name and a deleted one frees it; of two concurrent creates with one name, the second is refused once the first commits. - **Plan and script tests** (`listed_channel_name_postgres_tests.rs`) run the shipped SQL and shell script: which channel keeps the name, the starter cases, names at the 255-character limit, names with control characters or a leading `-`, and the auth and community stops. The starter-id computation matches the mobile app's test vectors. - The new guards were each removed once to confirm that a test fails. - The full local Postgres test runs (buzz-db, buzz-relay, buzz-admin) pass, except 6 tests that also fail locally on main and pass in CI. ### Database review checklist - [x] Phase: writer release (deploy), plus a maintenance script. The stacked PR adds the contract index; this release is its required stop. - [x] No trigger, function, procedure, rule or foreign key. - [x] No migration. The script writes nothing to the database itself. It reads a plan, and the relay applies each rename as a normal channel edit. `docs/database.md` Rule 3 asks for maintenance scripts in their own PR. The script is here because it depends on the operator rename in this PR. - [x] Contract: not in this PR. - [x] Rule 4 locations: no schema change. - [x] Deployed relay: the schema is unchanged, so the deployed relay keeps working. An older relay refuses the operator rename, so run the script only after this release is fully deployed. This release also works beside the contract index (tests above). - [x] Timeouts: no index build or bulk write here. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

The base branch was changed.

loganj · 2026-11-04T02:02:55Z

🤖 Rebased onto main 83d0bd320 (head 2cbfa03db). The rebase was clean: no conflicts, and 0081 is still the next migration number. I pushed with --no-verify. The local pre-push unit lane failed only in crates this PR doesn't touch (buzz-acp, conformance, push-gateway, test-client), because their fixtures resolved to another worktree on this machine. The buzz-db and buzz-admin unit tests passed. The Postgres lane for buzz-db, buzz-admin and buzz-relay passed every listed-name and migration test. Its other failures were tests that need Redis (not set up locally) and event_follow_up tests that fail the same way on main; one personal_read timing test passed on 3 reruns.

github-actions · 2026-11-04T02:05:16Z

🔐 Codex Security Review

Note: This is an automated, security-focused review generated by Codex.
Use it as a supplement to human review; false positives are possible.

Scope

Exact PR diff: 64d12e29751981ad92ab3cc8edadaf3e3b5797f3...108737dc0320f4f8f93cd37eed64123098606a25

Model: gpt-6.1-sol

💡 Click "edited" above to see earlier reviews for this PR.

Review Summary

Overall Risk: NONE

No concrete security, correctness, or reliability regressions found in the authorized PR range.

Findings

No concrete security, correctness, or reliability findings were identified.

Notes

Review used read-only inspection of the diff, surrounding source, callers, tests, migrations, and history. Builds and tests were not executed.

_{Generated by Codex Security Review |

Requested by: @TheSentinel454 |

Workflow run}

salman1993

🤖 Reviewed and approved on Salman's behalf by sol, his AI agent.

Re-reviewed 2cbfa03db7ba83d913e7740819c2c5e191b51ea7 against 83d0bd32034e4684836b10d0854e107c410c1e39. No blocking findings. Minimalism 9/10, elegance 9/10, correctness 9/10.

All four rebased commits have unchanged patches relative to a8653787f (git range-diff). Checked migration 0081, the desired-state index/parity, channel write/error mapping, tests, and rollout instructions against the repository database rules. The index preserves the listed-channel predicate and community boundary; the migration rejects missing/invalid prebuilds and avoids CREATE over a valid prebuild.

Validation: inspected the current PostgreSQL CI logs on merge da53e9b containing this head and base: all 1,380 tests passed, including the migration guards, writer-lock bypass, schema parity, name collisions/concurrency, and relay refusals. All 59 executed checks passed; 32 checks were skipped. Local diff whitespace check passed. No local build or live relay run in this re-review.

Code approval only: retain the merge/deployment hold until production runs #8782 on every serving pod, existing duplicates are renamed and validated to zero, and the unique index is prebuilt concurrently and verified per docs/channel-name-uniqueness-deployment.md. Production readiness was not verified by this review.

loganj · 2026-11-04T02:39:30Z

🤖 Moved back to draft to hold the merge until the rollout preconditions in docs/channel-name-uniqueness-deployment.md are met in every environment: prod runs #8782, prod duplicates are renamed, and the index is prebuilt.

Migration 0079 adds a unique partial index on (community_id, lower(name)) for listed channels: open, not unlisted streams and forums that are not deleted. It is the contract step for the relay check that refuses duplicate names on create and rename. The database now refuses a duplicate that an older relay, a raw SQL write or a missed code path could still produce. The index refuses a duplicate at the write itself, and a write that claims the name of a concurrent uncommitted one waits for it. So the relay's post-write check and its per-name advisory lock go. The store already maps the index violation to ChannelNameTaken, so the client still gets "invalid: an open channel named ... already exists". Test fixtures that inserted two open channels with one name now use distinct names, and tests that migrate a database with channels through 0079 prebuild the index first, as an operator does. The migration bounds its locks and run time. It refuses to start while duplicates remain, naming the repair script. On a populated channels table it refuses to build the index under a write-blocking lock and asks for a concurrent prebuild (docs/database.md Rule 6). It skips CREATE for a prebuild and then requires a valid, ready, live index with the exact expected definition. The desired-state schema has the same index, and the parity test compares the two. docs/channel-name-uniqueness-deployment.md gives the rollout order, the prebuild, the recovery and the rollback. The writer release is a required stop: deploy it, run scripts/maintenance/rename_duplicate_listed_channel_names.sql and prebuild the index there, before upgrading to this one. Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Logan Johnson <loganj@squareup.com>

The rollout doc now says the operator key must be a member of each community, how to rename duplicates in an archived community (unarchive, rename, archive again), and that a community being deleted must finish its deletion first. Step 3 prints the host and state of each community with duplicates. Step 5 names `buzz-admin migrate` for out-of-band deploys, warns against applying the file with psql, and says that a desired-state deploy follows steps 1 to 4 first. A test now holds a channel writer's lock while migration 0079 runs over a prebuilt index, so a CREATE INDEX IF NOT EXISTS there fails the test. Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Logan Johnson <loganj@squareup.com>

pg_get_indexdef qualifies the enum casts (`public.channel_visibility`) when `public` is not visible on the session search_path, so the exact definition compare in 0081, and the operator's verify query in the rollout doc, would report a valid prebuilt index as wrong. Pin the search_path in the migration and in the doc's verify query. Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Logan Johnson <loganj@squareup.com>

sqlx appends the server's source line (" at line 3897") to every Postgres error, so a message that ended in a doc path read as a line in that doc. Each refusal now names the migration, says what to do and which doc step covers it, and ends in a sentence. Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Logan Johnson <loganj@squareup.com>

Main took 0081 and 0082, so the migration is now 0083. With BUZZ_AUTO_MIGRATE on, a migration that refuses a populated table crash-loops every relay with data (#8802, docs/database.md Rule 6). The migration no longer refuses a channels table with rows. As 0049 does, it skips CREATE when to_regclass finds a prebuilt index, else builds the index with a plain CREATE UNIQUE INDEX under the 1s lock and 5s statement budgets, then verifies its definition and flags. A busy or very large table fails on those budgets, records nothing, and the relay retries at its next start. It still refuses to run while listed duplicates remain: the index cannot exist over them, and the renames must go through the relay. Tests that migrate a populated database no longer prebuild the index. The listed-name migration test now checks that a held channel writer makes the inline build fail on its lock budget, and that a populated table then migrates with no operator step. The rollout doc makes the concurrent prebuild an out-of-band option only. Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Logan Johnson <loganj@squareup.com>

loganj · 2026-11-05T00:56:49Z

🤖 Changed to follow the rule from #8802 that a migration must never refuse a populated table (tornquist asked for this in review routing). Head 108737dc0, rebased onto main e558f15fa:

The migration is now 0083 (main took 0081 and 0082).
It no longer refuses a channels table with rows. As 0049 does, it skips CREATE when to_regclass finds a prebuilt index, else builds the index with a plain CREATE UNIQUE INDEX under the 1s lock and 5s statement budgets, then verifies it. A busy or very large table fails on those budgets, records nothing, and the relay retries.
It still refuses to run while listed duplicates remain. The index cannot exist over them, the renames must go through the relay so clients get the new kind:39000, and a migration must not change rows (Rule 3). The writer release plus the rename stays a required stop.
Fixtures no longer prebuild the index. The listed-name test now also checks the lock-budget failure and a populated migrate with no prebuild.
The rollout doc makes the concurrent prebuild an out-of-band option only.

Pushed with --no-verify; the local lanes I ran are listed in the description. The PR stays draft until the rollout preconditions hold in every environment.

TheSentinel454

🤖 LGTM. Migration 0083 checks for duplicates and validates the index (exact def, valid/ready/live) under tight lock/statement timeouts. Every production channel write path maps the index violation to listed_name_taken. Duplicate listed names are now cleared in every environment we run.

- tested-image is sha-744f394 (block/buzz 744f3946f, after the #8802 fix), with tested-digest sha256:b67a32b7…; SKILL.md section 2 reads both from the metadata, so a pin move is one edit - installs and upgrades use it; compose.md step 6, the Compose upgrade and kubernetes.md step 6 check the pulled image's digest (Kubernetes not tested) - pick-tag.py runs only when the user asks for the newest, and says on stderr whether it's the pin - before an upgrade, Compose and Kubernetes check that no two open channels share a name (migration 0083, block/buzz#8787; not tested); on Kubernetes, a helm upgrade that times out means stop and ask, never helm rollback - starter channels: invite links and Add directly join them, add-member doesn't (#8594) - troubleshooting rows for a digest mismatch and migration 0083's refusal - the four smoke scripts default to the pin; smoke-local.sh, smoke.sh and smoke-vps.sh run the digest check and the upgrade's name check verbatim Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…ernetes upgrades ask about duplicate names too The restore flow's new Check first step came after Clear the way, which deletes the volumes, so a backup with a missing or empty file was caught only after the data was gone. The backup's files and address are now checked first, as operations.md says (Before changing anything); the empty-volume check stays right before the restore block, as 83cc0aa had it. The skill's Kubernetes upgrade checks for duplicate public channel names before helm upgrade (migration 0083, block/buzz#8787), so its What happens list gets the same ask as Compose's. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…2904) ## Summary A brand-new community has no channels, so its owner lands on a blank Messages page ("Select a channel to read it.") after onboarding. Until the relay creates a landing channel (block/buzz#9108), this PR has the owner's client do it, and nothing more. `useFirstChannel` (`src/bundled/channels/first-channel.ts`), called once from `ChannelWorkspace`, acts only when **all** of these hold: - the session is live (not cached), the channel list is `ready`, and the viewer has joined no stream or forum channel (Solo chats and DMs don't count); - the community roster says the viewer is the community **owner** (admins and members never act); - `channels.anyChannel()` (new: `{kinds:[39000], authors:[relay], "#t":["stream","forum"], limit:20}`, Solo-labelled streams skipped) finds **no** stream or forum, open, private or archived. DMs, Solo chats (the Bestie tab opens one first) and system channels don't count. A failed check does nothing and retries next launch. A full batch of 20 Solo chats counts as not empty: it creates nothing and settles the marker, so clients stop checking. It then creates one open `general` through the existing `channelCreation.create` and flags it as a starter channel with `auto-join-on`, so the relay (block/buzz#8594) joins new members to it. Messages opens it through its existing first-channel fallback (#1624). **Not spamming general channels:** - The relay's unique open channel names (block/buzz#8787) refuse a second `general` in the same community. - A settled view-state marker per community on each device means that device never checks again once the community has a channel. - At most one attempt per community per app run. A failure (for example, the name is already taken) waits for the next launch instead of retrying on every render. - It never joins anyone, adds members or posts a message. - Relay load: the community roster (`13534`, `limit: 1`) is read only for a viewer with no channel to open, so ordinary clients make no new reads. The channel check is a single read capped at 20 events, never a directory scan. Non-goals: welcome messages, landing-channel designation, server-side provisioning (block/buzz#9108 / #2623). ## Testing - `first-channel.test.tsx` (new, jsdom + RTL `renderHook`): - the owner of an empty community gets exactly one open `general` plus `auto-join-on`, and a later mount, even in a new run, doesn't read or create again; - a community where the relay already holds a channel settles without creating, and a failed check creates and settles nothing; - `anyChannel` sends exactly the capped `#t` filter, ignores Solo chats, counts an archived stream, and treats a full batch of Solo chats as not empty (store test); - admin, member and missing roles do nothing; - a joined channel, a loading list or a cached session do nothing and don't read the roster; - a refused create isn't retried in the same run. - Fail-then-pass: loosening the owner check fails 3 cases. - Full `vitest run` locally: 1022 files / 19379 tests pass; typecheck and `biome check` clean. - `vitest run src/bundled/channels src/bundled/moderation`: all pass, including the existing starter-channel `ChannelsPage` cases. `tsc --noEmit` and the pre-push hook suite pass. **Deferred:** - No agent run against a live relay yet. - Human test: create a community in onboarding, open Messages, and #general should appear and open. Reload, and nothing else gets created. A second member joins and lands in #general. - Browser suite left to CI. --------- Signed-off-by: Bradley Axen <baxen@squareup.com> Co-authored-by: mbot <3754f8729004d95654c46dbab3129e4ab9ef05cc2534e2a3fbfc155983bd637b@buzz.block.builderlab.xyz>

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salman1993 mentioned this pull request Oct 30, 2026

fix(relay): refuse a second listed open channel with the same name #8782

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brow mentioned this pull request Nov 1, 2026

fix(mobile): show a taken channel name plainly and keep invites working #8807

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loganj mentioned this pull request Nov 2, 2026

fix(desktop): skip a starter channel the relay will never create #8911

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loganj mentioned this pull request Nov 2, 2026

Follow-ups to unique listed channel names: starter channels on the relay, remove the operator rename #8927

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wpfleger96 mentioned this pull request Nov 5, 2026

fix(relay): close legacy sockets after community FI upgrades #8991

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[buzz] Recover interrupted default-channel auto-joins #9045

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baxen mentioned this pull request Nov 6, 2026

feat(channels): create #general for the owner of an empty community block/buzz-app#2904

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feat(db): enforce unique listed channel names with an index - #8787

feat(db): enforce unique listed channel names with an index#8787
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