# Session handoff — 2026-06-10 (61)

Sixty-first handover. Continues from handoff-60 (Gitea migration
cleanup + V1 relationship visualization, ADR-0044). This session was
a **list-trimming pass on "easy wins"**: it closed **X1**
(comprehensive logging, full sweep) and both **T3 residuals** (the two
ADR-0043 messaging-polish items). Four commits, all green, all
user-confirmed.

## §1. State at handoff

**Branch:** `main`. **HEAD `5a33f2a`.** 4 commits this session
(`a8ad0c6` → `5a33f2a`) on top of session-60's 5; push is the user's
step.

**Tests: 2211 passing / 0 failing / 1 ignored** (lib 1588, it 431,
typing_surface_matrix 192; the 1 ignored is the long-standing
doc-test). **Clippy clean** (nursery, all targets). +4 over the
handoff-60 baseline of 2207 (one test per residual at each of the
enrichment + render layers, plus the two grammar/worker tests).

This session's commits:
```
5a33f2a fix(fk): compound-FK violation message names every column pair
6985a43 fix(fk): inline FK referencing a compound PK points at the table-level form
0a7612e feat: comprehensive logging across parser, app, persistence, runtime (X1)
a8ad0c6 feat(db): comprehensive logging across worker + executors (X1)
```

## §2. X1 — comprehensive logging (closed, `[x]`)

The full-sweep instrumentation pass the "log liberally" standard
called for. **~75 → 135 `tracing` sites** under a documented level
discipline now living in the **`src/logging.rs` module doc** (read it
before adding logs — it is the durable convention).

**Levels:** `error` = unrecoverable; `warn` = recoverable / fallback
taken; `info` = low-volume lifecycle (worker start/exit, project
open); `debug` = the bulk, one line per *executed* command + its
decision points (off by default, opt-in `RDBMS_PLAYGROUND_LOG=debug`);
`trace` = hot paths only (per-keystroke parse, per-key input).

**Where logs go (was a point of confusion):** always a **file**
(stdout/stderr would corrupt the TUI). Path precedence: `--log-file`
> `RDBMS_PLAYGROUND_LOG_FILE` > default `~/.rdbms-playground/
playground.log` (append mode). Level filter is the *separate*
`RDBMS_PLAYGROUND_LOG` env var, default `info`.

**Coverage by commit:**
- `a8ad0c6` **db.rs** (26→67): entry-`debug!` on all 34 `do_*`
  executors (DDL/DML/relationship/index/read), matching the existing
  `do_sql_delete`/`do_run_select` style — so the route through
  *delegating* executors (e.g. `add_column` →
  `add_constrained_column_via_rebuild`) is visible in the log
  *sequence*. Decision-point logs: `rebuild_table_with_copy`
  begin/commit (+ FK-check-failure and `foreign_keys` re-enable
  failure as `warn`), `do_insert` autofill summary, `do_delete`
  cascade summary, `do_create_table` FK resolution. Worker
  start/exit `debug!`→`info!`.
- `0a7612e` **rest**: `persistence/mod.rs` logs every yaml/CSV/history
  write (the silent-failure disk paths); `runtime.rs`
  `execute_command_typed` dispatch; `app.rs` submit /
  `dispatch_app_command` / ADR-0044 diagram-vs-prose render choice;
  `dsl/parser.rs` parse begin/outcome at **`trace`** (the
  `parse_command_inner` choke point — `completion.rs` re-parses
  per-keystroke, probing candidates in a loop, so `debug` would
  flood).

**Verification:** emission proven end-to-end through the *real* worker
thread + real `logging::init` via two throwaway smoke tests (db path
and persistence path), both since deleted. The DA-honest gap: a few
internal read-only helpers (`do_find_rows_matching`,
`do_read_relationships`, `do_list_names_for`) and the thin `*_request`
wrappers are not *individually* instrumented — the wrappers delegate
to logged executors (skipped to avoid double-logging), the helpers are
low-value. Effective coverage is complete via logged entry points; it
is not literally 44/44.

## §3. T3 residuals — both closed (ADR-0043)

Two messaging-only items carried since handoff-59 §4; FK
correctness/enforcement was never affected.

**#1 — inline-FK arity wording (`6985a43`).** `col REFERENCES P(a,b)`
referencing a compound PK gave the generic arity error. An inline
column-level FK is single-column by construction, so it now points at
the table-level form: *"an inline column reference can only name one
column … Use the table-level form instead: `FOREIGN KEY (<columns>)
REFERENCES P (a, b)`."* Mechanism: new **`inline: bool` on
`SqlForeignKey`**, set by the single shared grammar builder
`consume_fk_reference` (true for the inline path at `ddl.rs:1560`,
false for table-level `1590` and `build_alter_fk`); threaded into
`resolve_fk_parent_columns`, which tailors the arity-mismatch message
when `inline && parent_key.len() > 1`. 6 construction sites total (2
grammar + 1 ALTER delegate + 3 test literals) — hand-edited, **not**
the scripted sweep handoff-59 §4 warned about. The bare inline form
(`col REFERENCES P`, no parens) hits the same arity branch, so it is
covered by the same code (tested via the explicit-parens form).

**#2 — compound-FK violation names every pair (`5a33f2a`).**
`enrich_fk_violation` (`runtime.rs`) picked only `local_columns
.first()` / `other_columns.next()`. It now gathers all pairs of the
matched relationship and carries them **comma-joined in the existing
single-column facts slots** (`column`, `parent_column`, `value`), so
the headline reads *"no parent row in `Region` has `country, code` =
`7, 8`."* No facts-model or catalog change — joined strings flow
through the existing `{parent_column}`/`{value}` placeholders.
Single-column behaviour is byte-identical (a one-element join is the
element). **Known minor awkwardness:** the *verbose hint* interpolates
`{parent_table}.{parent_column}` → `Region.country, code`, which reads
a touch oddly; the headline is clean. A perfectly-formatted compound
hint would need catalog work, out of scope for a messaging-polish
residual — flagged, not fixed.

## §4. Remaining open landscape (unchanged except X1)

**Closed this session:** X1 → `[x]`; both T3 residuals (ADR-0043 fully
wrapped — no residuals left).

**Still `[/]` / `[~]` / larger (design-first, own ADR):**
- **V2 / S3** multi-result tabs — output-model redesign.
- **V3** whole-DB ER export; **V4** scrollable journal + Markdown
  (also the home for diagram live-reflow, ADR-0044 OOS-1).
- **A1** app-commands — blocked on `seed` (SD1) + `hint` (H2).
- **H1a** parse-error syntax help (partial; ADR-0021).
- **DOC1** reference docs.

**`[ ]` not started:** H2 `hint`, SD1 `seed`, C4 m:n convenience, B3
query-timeout, I1 multi-line input, I1b readline shortcuts, I5
cancellation, **TT5 CI** (now Gitea Actions / Woodpecker — a fresh
decision tied to the migration + ADR-0001's reopened distribution
question), TT4 PTY (spec-only), D1–D3 distribution, NFR-1…7.

**ADR-0044 OOS for later:** OOS-7 user-configurable relationship-
display setting (always-prose / always-diagram / auto-by-width).

## §5. Next job — candidates (by readiness)

No forced next step. Recommended order:
1. **TT5 CI** — test infra is solid (2211 green) and now there is real
   logging to surface failures; no pipeline yet. A fresh **Gitea
   Actions / Woodpecker** decision (earns a short ADR; ties into
   ADR-0001's reopened distribution question). Highest leverage:
   protects everything else.
2. **SD1 `seed`** then **H2 `hint`** — the two unblockers for **A1**
   app-commands; both are net-new, self-contained features (each its
   own ADR).
3. **C4 m:n convenience** — auto-generate a junction table; depends on
   relationships, which are now solid (ADR-0043/0044 done).
4. **V2/S3 tabs** or **V4 journal** — larger output-model redesign;
   design-first, own ADR. V4 also unlocks diagram live-reflow.

## §6. How to take over

1. Read handoffs 59 → 60 → 61, then `CLAUDE.md` (Gitea/`tea` section),
   `docs/requirements.md` (X1 now `[x]`), `docs/adr/README.md`.
2. **Before adding any logging:** read the level-discipline block in
   the `src/logging.rs` module doc (the X1 convention).
3. **For FK/relationship work:** ADR-0043 (compound FKs) + ADR-0044
   (visualization) are both fully landed; `SqlForeignKey` now carries
   `inline`.
4. Codebase on `main` at `5a33f2a`, clean, 9 commits unpushed (5 from
   session 60 + 4 this session).
5. Process pins that paid off: **verify log emission end-to-end, not
   just that it compiles** (throwaway smoke tests through the real
   worker thread caught nothing broken but proved the stack);
   **hot-path logging belongs at `trace`, not `debug`** (the parser);
   **test-first on both residuals** (red → green at every layer);
   **hand-edit struct-field ripples, never script them** (handoff-59
   §4's scare avoided). Commits user-confirmed, append-only, no AI
   attribution.
