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## Why Finish the replaceable-event slice of [tracker #2](https://github.com/TheSentinel454/buzz/issues/2) and [domain issue #6](https://github.com/TheSentinel454/buzz/issues/6) without disturbing the runtime/store boundary established by #6660 and #6668. PR #6700 has merged; this PR now targets current main containing its replacement lock and transaction observability. ## What - Move `Db::replace_addressable_event`, its SQL, lock/transaction instrumentation, and focused addressable/parameterized replacement tests from `lib.rs` to `replaceable.rs` - Preserve the transaction-required parameterized API, replacement ordering, rollback semantics, mention indexing, and exactly one datastore span per public operation - Keep implementation and focused PostgreSQL tests co-located; follow-up review removed the dedicated replaceable ownership source guard as low value ## Stack - Exact base: main atf249710331- Exact head: codex/issue-6-finish-replaceable-store atda018405cc- Tracker: https://github.com/TheSentinel454/buzz/issues/2 - Domain: https://github.com/TheSentinel454/buzz/issues/6 - Test/span acceptance: https://github.com/TheSentinel454/buzz/issues/17 and https://github.com/TheSentinel454/buzz/issues/19 ## Non-goals - No SQL, schema, retry, timeout, lock ordering, transaction boundary, or client-visible behavior changes - No store traits, domain-handle redesign, `PgExecutor` migration, raw pool accessor, new crate, or directory reorganization - No changes to, retargeting of, or merge action on PR #6700 ## Risk Assessment Low. This is a mechanical ownership move with unchanged signatures and SQL. The primary review risk is losing or nesting instrumentation, covered by exact moved PostgreSQL tests and the cumulative production-diff audit. ## Blox Verification Author workstation: `buzz-tornquist-issue-2-store-stack` (`2046520`), exact head `2de5444e14606ce6912d1bb932bc88bffa379a77`. - `cargo fmt --all --check` — passed - `cargo clippy -p buzz-db -p buzz-relay --all-targets -- -D warnings` — passed - `cargo test -p buzz-db --quiet` — 108 passed, 200 ignored; both integration source guards passed - Native PostgreSQL: `cargo test -p buzz-db replaceable::tests:: -- --ignored --test-threads=1` — 11 passed - `cargo test -p buzz-relay --lib api::mesh_demo::tests::demo_join_forwarded_arm_round_trips_echo -- --exact --test-threads=1` — passed - Full serial relay suite was also exercised: 908 tests passed but the existing load-sensitive mesh demo test returned 504 under suite load, matching PR #6700's documented baseline; it passed in isolation and this diff does not touch that subsystem Independent exact-head Blox review: `buzz-tornquist-pr-6777-review` (`2047422`) at `2de5444e14606ce6912d1bb932bc88bffa379a77`. - Review findings — none (critical, important, or minor) - `cargo fmt --all --check` and the ownership guard — passed - `cargo clippy -p buzz-db -p buzz-relay --all-targets -- -D warnings` — passed - `cargo test -p buzz-db --quiet` — 108 passed, 200 ignored; source guards passed - Native PostgreSQL moved suite — 11 passed - `cargo test -p buzz-relay --lib` — 909 passed, 48 ignored Generated with Codex ## Superseded pre-comment restack verification PR #6700 merged before publication completed. This layer was restacked onto current main through the exact parent named above; the final cumulative tip is 2ddcc8a29f95c8c8c9cb87bb6cf59335f2190fae. Cumulative author gates passed: formatting and diff checks; buzz-db and buzz-relay all-target clippy with -D warnings; DB lib 111 passed / 200 ignored; ownership 22/22; observability 1/1; the full isolated PostgreSQL domain matrix; and relay lib 910 passed / 49 ignored. - Workstation: `buzz-tornquist-pr-6777-final-review` (`2057617`), fresh shallow checkout - Base: `f24971033178926153b49d320bd876d15d9cb2bf` - Head: `ffbeaaf00810aa359ab85818ff4820f92263e45f` - Findings: none Reviewed `base..head` for the replaceable-store extraction. The addressable replacement SQL, stale/duplicate outcomes, advisory-lock ordering, transaction rollback/commit boundaries, mention-index atomicity, and public `Db` signature are retained in `replaceable.rs`. The PR #6700 transaction timer remains around the same logical transaction through `TransactionTimer::observe`, and the public operation has exactly one datastore span. Focused addressable and parameterized tests moved with the implementation; the ownership guard excludes duplicates from `lib.rs`. Verification: format and diff checks passed; `buzz-db --all-targets` clippy passed with `-D warnings`; DB lib tests passed (111 passed, 200 PostgreSQL tests ignored); ownership (1/1) and observability (1/1) guards passed; all 11 replaceable PostgreSQL tests passed on native PostgreSQL 17 with migrations 1-32 successful; relay lib test target compiled successfully. Final worktree was detached at the exact head and clean. Complete evidence archive SHA-256: `e37f92bbde4e2343196085095b3093b1bc78196be58bc86826325e0e1639d7ea`. ## Comment-addressed restack Review follow-up removed the dedicated `replaceable_store_has_single_ownership` source test as requested. No production code changed. - Exact base: `f24971033178926153b49d320bd876d15d9cb2bf` - Exact head: `da018405cc83605362125c2d5e5a3f91492431ac` - Final cumulative tip: `6fa2f104d42c6ba85bdf62e7ccb74ceaf4a84f67` - Focused PR verification: formatting and diff checks passed; strict `buzz-db`/`buzz-relay` Clippy passed; DB lib 111 passed / 200 ignored; all 11 replaceable PostgreSQL tests passed. - Cumulative Blox gate: formatting and diff checks; strict `buzz-db`/`buzz-relay` Clippy; DB lib 111 passed / 200 ignored; ownership 21/21; observability 1/1; every moved PostgreSQL test; relay lib 910 passed / 49 ignored. - Independent re-review at this exact head: no findings; fresh exact-parent/head Blox review passed fmt/diff, strict `buzz-db` Clippy, DB lib 111 passed / 200 ignored, manual one-owner/one-span replacement checks, observability, 11 replaceable PostgreSQL tests, and relay compilation. --------- Signed-off-by: tornquist <tornquist@squareup.com>