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:

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.
SD1 seed then H2 hint — the two unblockers for A1 app-commands; both are net-new, self-contained features (each its own ADR).
C4 m:n convenience — auto-generate a junction table; depends on relationships, which are now solid (ADR-0043/0044 done).
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

Read handoffs 59 → 60 → 61, then CLAUDE.md (Gitea/tea section), docs/requirements.md (X1 now [x]), docs/adr/README.md.
Before adding any logging: read the level-discipline block in the src/logging.rs module doc (the X1 convention).
For FK/relationship work: ADR-0043 (compound FKs) + ADR-0044 (visualization) are both fully landed; SqlForeignKey now carries inline.
Codebase on main at 5a33f2a, clean, 9 commits unpushed (5 from session 60 + 4 this session).
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.

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