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feat(ui): relationships sidebar panel + schema data (#21, ADR-0046 DB2/DB4)

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The left column now stacks a Tables panel over a Relationships panel.
Each relationship renders as three narrow lines — its name, then the
endpoints broken at the arrow (Customers.id -> / indented
Orders.customer_id) — ellipsized past the inner width. The panel is
content-sized within [5 rows ("(none)" when empty), half the column];
the Tables panel keeps the rest (>=3 rows). Phase C adds focus+scroll
for content beyond the cap (clipped for now).

Data path: a new worker Request::ReadAllRelationships +
Database::read_all_relationships returns full RelationshipSchema
records; the runtime posts them via a RelationshipsRefreshed event
alongside the schema-cache refresh, and the App holds them in a new
`relationships` field.

ADR deviation (recorded in ADR-0046 DB2 + index): DB2 specified this
data on SchemaCache; it lives on the App instead — SchemaCache is
walker/completion-facing and needs only relationship names (untouched),
while the full records are UI-only, so App is the cleaner home and it
avoids editing ~23 SchemaCache literals. No behavioural difference.

Tests: panel-height bounds, the three-line render, the empty "(none)"
case, a snapshot, read_all_relationships end-to-end (real DB via the
m:n junction), and the event->field handler.
This commit is contained in:
claude@clouddev1
2026-06-10 18:44:27 +00:00
parent 386627a262
commit 94825d0f36
12 changed files with 324 additions and 26 deletions
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src/snapshots/rdbms_playground__ui__tests__relationships_panel_dark.snap
+29
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---
source: src/ui.rs
assertion_line: 2789
expression: snapshot
---
╭ Tables ──────────────────╮╭ Output ────────────────────────────────────────────────────────────────────────╮
│Customers ││ │
│Orders ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ ││ │
│ │╰────────────────────────────────────────────────────────────────────────────────╯
│ │╭ SIMPLE ────────────────────────────────────────────────────────────────────────╮
╰──────────────────────────╯│ │
╭ Relationships ───────────╮╰────────────────────────────────────────────────────────────────────────────────╯
│Customers_Orders │╭ Hint ──────────────────────────────────────────────────────────────────────────╮
│ Customers.id -> ││Type a command — press Tab for options, `help` for a list │
│ Orders.customer_id ││ │
╰──────────────────────────╯╰────────────────────────────────────────────────────────────────────────────────╯
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