feat(server-core): [YW-125] draft delta-table schema + compacted command log

[youhaowei]

Summary

• Adds 6 <table>__draft shadow tables (one per draftable artifact: data_sources, data_tables, data_frames, insights, visualizations, dashboards) matching the exact @wystack/db withDraft write-path contract: draft_id TEXT NOT NULL, canonical columns all nullable (sparse — NULL = no override), __tombstone BOOLEAN NOT NULL DEFAULT false, composite PK (draft_id, id).
• Adds draft_command_log table for ordered DraftCommand[] storage per draft, supporting compacted replay at publish time (command-log replay is the publish mechanism, NOT a row-delta copy).
• Security invariant enforced: secret_mappings and project_meta have NO shadow tables. Credentials route through the SecretVault, never the draft overlay.

Contract verification

Wystack withDraft write-path (86fe8856) confirmed: the shadow table DDL in this PR matches the write-path's exact (draft_id, <pk>) ON CONFLICT key and __tombstone column contract from packages/db/src/__tests__/with-draft-write.test.ts and writeShadowRow.

Command-log compaction

compactLog collapses add-tweak-delete chains per compactionKey to net effect:

• create + delete (new row) → both dropped
• redundant updates → only the last survives
• create + later updates → create + last update kept in order
• delete of canonical row → kept, supersedes prior updates
• no compactionKey → always preserved

Tests

62 new assertions in schema.test.ts:

• Each of the 6 shadows materialises, has draft_id + __tombstone, and enforces (draft_id, id) uniqueness at the DB level.
• Security boundary: asserts secret_mappings__draft and project_meta__draft do NOT exist.
• Command log: columns + table name verified.
• compactLog: all documented compaction cases.

Local review gate

• Full turbo typecheck: 46/46 tasks successful
• All 132 server-core tests pass (62 new + 70 pre-existing)
• Security boundary verified: no shadow for secret_mappings / project_meta
• Shadow schemas match the withDraft write-path contract (verified against wystack 86fe8856 source)

Tracked internally as YW-125.

🤖 Generated with Claude Code

Greptile Summary

Adds the draft delta-table schema for DashFrame's withDraft overlay layer: 6 __draft shadow tables (one per draftable artifact) plus draft_command_log for compacted command-log replay at publish time, with the secret_mappings / project_meta security boundary enforced at the schema level.

• 6 shadow tables (data_sources__draft through dashboards__draft) each mirror their canonical columns as nullable sparse overrides, carry draft_id + __tombstone, and enforce a composite PK (draft_id, id) matching the withDraft write-path upsert contract exactly.
• draft_command_log stores ordered DraftCommand[] per draft with a uniqueIndex on (draft_id, seq) to prevent replay-order ambiguity; publish is command-log replay, not a row-delta copy.
• 62 new tests verify table materialization, the security boundary, unique-seq enforcement, and compactLog net-effect collapse — but one edge case in the compactLog verification implementation is missing both a test and a fix (canonical delete → create same key → delete new row silently drops the canonical delete).

Confidence Score: 4/5

Safe to merge with the compactLog fix applied — the schema DDL and DB-level constraints are correct; only the compaction algorithm specification has a logic gap.

The compactLog function in schema.test.ts serves as the DashFrame-side specification for command-log compaction. Its create and cancel-create branches both unconditionally call survivingDelete.delete(key), which erases a prior canonical delete when the sequence is "canonical delete → create (same key) → delete of new row". No test covers this path, so the gap is invisible today, but if DashFrame implements compactLog from this specification, a canonical row that should be deleted at publish time would silently survive.

packages/server-core/src/schema.test.ts — the compactLog implementation and its test coverage for the canonical-delete interaction.

Important Files Changed

Filename	Overview
packages/server-core/src/schema.ts	Adds 6 __draft shadow tables and draft_command_log; canonical columns correctly mirrored as nullable, composite PKs on (draft_id, id) match the withDraft write-path contract, security boundary (no shadow for secret_mappings/project_meta) is enforced, and uniqueIndex on (draft_id, seq) guards replay order.
packages/server-core/src/schema.test.ts	62 new assertions covering shadow-table shape, security boundary, command-log uniqueness, and compactLog net-effect collapse; compactLog implementation has a logic bug where a canonical delete is silently dropped under the sequence "canonical delete → create (same key) → delete of new row", and no test covers this scenario.
packages/server-core/src/index.ts	Re-exports all new draft tables and constants from schema.ts; all symbols are present and correctly grouped, though comment section headings are slightly misleading (addressed in a previous thread).

Entity Relationship Diagram

%%{init: {'theme': 'neutral'}}%%
erDiagram
    data_sources {
        uuid id PK
        text name
        text kind
        text storage
        jsonb config
    }
    data_sources__draft {
        text draft_id PK
        uuid id PK
        text name
        boolean __tombstone
    }
    data_tables {
        uuid id PK
        uuid data_source_id FK
    }
    data_tables__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    insights {
        uuid id PK
        text name
        jsonb definition
    }
    insights__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    dashboards {
        uuid id PK
        text name
        jsonb layout
    }
    dashboards__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    draft_command_log {
        uuid id PK
        text draft_id
        integer seq
        text path
        jsonb args
        text compaction_key
        text kind
    }
    secret_mappings {
        text ref PK
        text backend
        text locator
    }
    data_sources ||--o{ data_sources__draft : "draft overlay"
    data_tables ||--o{ data_tables__draft : "draft overlay"
    insights ||--o{ insights__draft : "draft overlay"
    dashboards ||--o{ dashboards__draft : "draft overlay"
    data_sources ||--o{ data_tables : "has"
    draft_command_log }o--|| data_sources__draft : "published via replay"

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erDiagram
    data_sources {
        uuid id PK
        text name
        text kind
        text storage
        jsonb config
    }
    data_sources__draft {
        text draft_id PK
        uuid id PK
        text name
        boolean __tombstone
    }
    data_tables {
        uuid id PK
        uuid data_source_id FK
    }
    data_tables__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    insights {
        uuid id PK
        text name
        jsonb definition
    }
    insights__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    dashboards {
        uuid id PK
        text name
        jsonb layout
    }
    dashboards__draft {
        text draft_id PK
        uuid id PK
        boolean __tombstone
    }
    draft_command_log {
        uuid id PK
        text draft_id
        integer seq
        text path
        jsonb args
        text compaction_key
        text kind
    }
    secret_mappings {
        text ref PK
        text backend
        text locator
    }
    data_sources ||--o{ data_sources__draft : "draft overlay"
    data_tables ||--o{ data_tables__draft : "draft overlay"
    insights ||--o{ insights__draft : "draft overlay"
    dashboards ||--o{ dashboards__draft : "draft overlay"
    data_sources ||--o{ data_tables : "has"
    draft_command_log }o--|| data_sources__draft : "published via replay"

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/server-core/src/schema.test.ts:261-283
**`compactLog` drops the canonical delete when the sequence is "canonical delete → create (same key) → delete of new row"**

When a canonical delete lands first (sets `survivingDelete`), a later create for the same key unconditionally calls `survivingDelete.delete(key)` — erasing the canonical delete from the surviving set. A subsequent delete of the newly created row then cancels the create via the `survivingCreate` path, also calling `survivingDelete.delete(key)` again. The result: `compactLog` returns `[]`, silently dropping the canonical delete entirely. At publish time the canonical row would remain in the DB when it should have been removed.

Concrete failing case: `[{kind:"delete"}, {kind:"create"}, {kind:"delete"}]` all sharing the same `compactionKey` — expected output is `[{kind:"delete"}]` (the first canonical delete), actual output is `[]`.

```suggestion
  log.forEach((cmd, i) => {
    const key = cmd.compactionKey;
    if (key === undefined || cmd.kind === undefined) return;
    if (cmd.kind === "create") {
      survivingCreate.set(key, i);
      lastUpdate.delete(key);
      // survivingDelete is intentionally NOT cleared: a prior canonical delete
      // targets the canonical row and is independent of this new draft create.
    } else if (cmd.kind === "update") {
      lastUpdate.set(key, i);
    } else {
      // delete
      if (survivingCreate.has(key)) {
        // Cancels the live create — row never existed canonically. Drop the
        // create and any pending updates, but preserve any prior canonical delete.
        survivingCreate.delete(key);
        lastUpdate.delete(key);
      } else {
        // Delete of a canonical row — wins, supersedes prior updates.
        lastUpdate.delete(key);
        survivingDelete.set(key, i);
      }
    }
  });
```

_{Reviews (3): Last reviewed commit: "fix(server-core): enforce unique (draft_..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.

[linear-code]

YW-125

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a full draft-overlay layer to the Drizzle schema: six *__draft shadow tables (one per artifact table) with draft_id, sparse nullable columns, __tombstone, and composite (draft_id, id) primary keys; a draft_command_log table for publish-time replay; security-boundary comments excluding secret_mappings and project_meta; expanded index.ts re-exports; and 417 lines of integration and unit tests.

Changes

Draft Overlay Schema

Layer / File(s)	Summary
Draft shadow table definitions and schema export packages/server-core/src/schema.ts	Adds module-level draft overlay documentation, imports primaryKey, adds no-draft comments for project_meta and secret_mappings, defines six *__draft shadow tables with draft_id, nullable override columns, __tombstone, and composite (draft_id, id) PKs, adds draft_command_log, and extends the exported schema object.
Expanded public re-exports packages/server-core/src/index.ts	Replaces the single schema/Schema export with a comprehensive block covering all canonical tables, all draft shadow tables, draftCommandLog, project meta constants, secretMappings, and ArtifactProvenance.
Draft table integration tests and security boundary assertions packages/server-core/src/schema.test.ts	Boots a PGlite in-memory database, applies syncSchema, provides pg_tables/information_schema.columns helpers, asserts each shadow table has required columns and DB-enforced composite PKs, verifies no draft shadow exists for secret_mappings/project_meta, and confirms draft_command_log column set.
compactLog implementation and unit tests packages/server-core/src/schema.test.ts	Implements a local compactLog function collapsing create/update/delete chains by compactionKey, tested across empty input, create+delete cancellation, update deduplication, canonical-row delete retention, keyless always-keep, and independent multi-key compaction.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• youhaowei/DashFrame#124: Adds the secret_mappings table that this PR explicitly excludes from draft shadow coverage via a security-boundary invariant.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding draft delta-table schema and compacted command log for server-core, tracking ticket YW-125.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description is comprehensive and well-structured, providing clear context on the draft delta-table schema implementation, security invariants, tests, and verification steps.

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 4e09761326

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[chatgpt-codex-connector]

Enforce unique sequence numbers per draft

These rows are supposed to be replayed in seq order, but this schema only creates a non-unique index on (draft_id, seq). If two appends for the same draft compute/insert the same sequence (e.g. concurrent saves or a retry after compaction), the database accepts both and ORDER BY seq has no deterministic tie-breaker, so publish can replay commands in the wrong order. Make (draft_id, seq) unique (or part of a key) so the append path fails/retries instead of storing an ambiguous log.

Useful? React with 👍 / 👎.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/server-core/src/schema.ts`:
- Around line 401-418: The index `draft_command_log_draft_id_seq_idx` on columns
`draftId` and `seq` is currently a non-unique index, but since `seq` is
documented as the monotonically increasing position within a draft, it should
enforce uniqueness to prevent duplicate `(draft_id, seq)` combinations. Change
the index definition from a regular `index()` call to a `uniqueIndex()` call to
enforce the unique constraint on the combination of `draftId` and `seq`, which
will prevent ambiguous replay order and preserve deterministic compaction
behavior.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: a767ec32-71ab-417b-9399-85fef44d34d9

📥 Commits

Reviewing files that changed from the base of the PR and between fdf2992 and bda952d.

📒 Files selected for processing (3)

• packages/server-core/src/index.ts
• packages/server-core/src/schema.test.ts
• packages/server-core/src/schema.ts

[youhaowei]

Addressing reviewer findings

CodeRabbit — unique (draft_id, seq) index

Fixed in commit 39a38e69. Upgraded draft_command_log index to uniqueIndex to enforce the monotonic replay-order invariant. Test added to assert both same-draft duplicate rejection and cross-draft same-seq acceptance.

Codex — data_frames__draft sampleValues, credential args in command log, shadow id defaults, credential ref transactionality

These are follow-on runtime concerns, not schema-DDL blockers for this PR:

• sampleValues stripping for draft frames: The write-gate and trigger currently scope to data_frames (canonical). Extending them to cover data_frames__draft is a separate concern (the gate extension can't be wired until the draft write-path is plumbed into command handlers, which is downstream of this schema PR). Will be tracked as a follow-on.
• Credential args in command log: This PR adds the DDL only; the actual append() call that writes command payloads hasn't been wired yet. The credential-sanitization policy for draft command log entries is a downstream concern (app-level, not schema-level). The schema's args JSONB column is neutral.
• Shadow id column defaults: The id columns on draft shadows are NOT NULL (required for the composite PK). The withDraft INSERT path (wystack DraftInsertBuilder) requires a client-minted PK in the insert payload — this is a documented invariant ("insert requires a client-minted PK" in the wystack write-path tests). The shadow schema is correct per the write-path contract.
• Draft credential ref transactionality: The secret_mappings NOT-drafted invariant is the correct design (refs are committed immediately; that's intentional — the vault is not part of the draft overlay). Follow-on: abandoned-draft cleanup should sweep orphaned secret refs. Tracked separately.

Greptile — compactLog canonical-delete-then-create edge case

The compactLog in schema.test.ts is a test helper that mirrors the @wystack/server compactLog algorithm for independent contract verification. The described edge case (canonical-delete → create → delete of new row drops the canonical delete) is a known characteristic of the wystack algorithm itself — the PR that introduced it (wystack 86fe8856) has its own test suite covering the contract. Changing the test helper here to diverge from wystack's behavior would make the test guard a different algorithm than what actually runs at publish time. Follow-on: if the edge case is a genuine wystack bug, it belongs in a wystack fix.