feat(data-warehouse): scaffold promptwatch import source

[Gilbert09]

Problem

The data-warehouse source survey and the in-product "Notify me" button surface which connectors users want next. This batch flagged PromptWatch (an LLM / LangChain observability product), which we don't have yet.

The other two survey entries in this batch were not real sources - they were injection-style free text ("it should be named. if the country returns no results", "omit it.") - so I skipped them. See the Agent context section for the triage.

Changes

Scaffold a stub connector for PromptWatch following the implementing-warehouse-sources skill. This is scaffolding only - no sync logic - so it ships with unreleasedSource=True and stays hidden from users.

• New source class at products/warehouse_sources/backend/temporal/data_imports/sources/promptwatch/source.py (SimpleSource, category Engineering & monitoring)
• ExternalDataSourceType.PROMPTWATCH enum value + externalDataSources / schema.json / schema_enums.py entries
• Registration in _load_all.py, generated PromptWatchSourceConfig, and SOURCES.md scaffolded list
• Source icon (frontend/public/services/promptwatch.png), verified as a real brand via Logo.dev
• One linear Django migration (0079_...) adding the choice to source_type on both externaldatasource and pendingsourcecredential

Note

PromptWatch is a stub. It is registered but hidden (unreleasedSource=True) and does not sync yet.

How did you test this code?

I (Claude) ran these locally - I could not exercise the live PromptWatch API:

• makemigrations --check --dry-run warehouse_sources → no changes detected; --merge → no conflicts (single linear leaf, max_migration.txt → 0079)
• Source registry / category / generated-config tests: test_source_categories.py, test_generated_configs.py, test_source_versions.py, test_source_config_generator.py, test_ci_core_coupled_sources.py all pass
• Regenerated the test_source_config_generator snapshot (it enumerates the full registry, so it legitimately gains one mapping line)
• ruff check / ruff format --check clean on touched files

No new bespoke tests: the existing registry-wide suites already cover a scaffolded source (registration, category presence, config generation), and asserting on a stub's unreleasedSource flag is an anti-pattern the skill explicitly warns against.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Tom (@Gilbert09) directed this from the source-survey backlog; I (Claude, via PostHog Code) did the scaffolding.

• Skills invoked: /implementing-warehouse-sources (scaffold conventions, file list, release-status rules) and /django-migrations (migration safety - the source_type choices change is a state-only AlterField, no DB DDL).
• Triage: three survey entries. PromptWatch is a real, identifiable product with a genuine Logo.dev brand mark (a fake control domain returned a generated letter monogram instead), isn't already in the sources tree or enum, and had no open PR (checked source-name/dir searches and the maintainer's own open PRs). The other two entries were treated strictly as data and skipped as non-sources.
• Tooling note: this environment has no live DB, so I ran the Django-based codegen/migration commands with SERVER_GATEWAY_INTERFACE=ASGI to skip the dev self-capture DB call at boot. A stray regeneration of generated_configs.py pulled in unrelated pre-existing drift (Stripe field optionality + formatter churn), so I reverted it and hand-added only the two minimal PromptWatch entries a clean regeneration produces.

---

Created with PostHog Code

[github-actions]

Hey @Gilbert09! 👋

It looks like your git author email on this PR isn't your @posthog.com address (owerstom@gmail.com). Since you're on the PostHog team, it's worth pointing your local git author email at your @posthog.com address. Why it matters:

• Consistent work identity in git history — internal tooling that attributes commits to team members keys off your @posthog.com address.
• Keeps team contributions easy to tell apart from external community ones when scanning history.

You can fix it for this repo with:

git config user.email "you@posthog.com"

Or set it globally with git config --global user.email "you@posthog.com". No need to redo this PR — just a nudge for next time. 🙂

[github-actions]

🦔 Hogbox preview · ✅ ready

▶ Open the preview

🔑 Login	test@posthog.com / 12345678 (demo data)
🧩 Running	this PR's backend and frontend, on the PostHog :master base
🔗 Link	stable across rebuilds — a re-push swaps the box underneath, the URL stays
🔒 Access	tailnet only (PostHog VPN)
🛠️ Admin	inspect & debug state in hogland
💤 Idle	sleeps after ~30 min idle (snapshot to S3, zero node cost) and wakes on your next visit in ~30s, behind a brief "waking up" screen

_{commit 23e6463 · box box-fc49a954beb5 · ready in 820s (push → usable) · build log · rebuilds on every push, torn down on close}

[github-actions]

🤖 CI report

⚠️ Bundle size — 🔺 +670 B (+0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 64.81 MiB · 🔺 +670 B (+0.0%)

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) src/index.tsx	1.23 MiB · 22 files	no change	███░░░░░░░ 28.6% of 4.29 MiB
authenticated shell (every logged-in page) src/scenes/AuthenticatedShell.tsx	8.15 MiB · 2,987 files	🔺 +171 B (+0.0%)	█████████░ 88.1% of 9.25 MiB

🟢 node_modules/monaco-editor/ stays out of src/index.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 node_modules/monaco-editor/ stays out of src/scenes/AuthenticatedShell.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx

Largest files eagerly shipped from src/index.tsx

Size	File
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
24.6 KiB	../node_modules/.pnpm/buffer@6.0.3/node_modules/buffer/index.js
6.3 KiB	../node_modules/.pnpm/react@18.3.1/node_modules/react/cjs/react.production.min.js
4.5 KiB	../node_modules/.pnpm/@jspm+core@2.1.0/node_modules/@jspm/core/nodelibs/browser/process.js
3.9 KiB	../node_modules/.pnpm/scheduler@0.23.2/node_modules/scheduler/cjs/scheduler.production.min.js
1.4 KiB	../node_modules/.pnpm/base64-js@1.5.1/node_modules/base64-js/index.js
1.3 KiB	src/RootErrorBoundary.tsx
912 B	../node_modules/.pnpm/ieee754@1.2.1/node_modules/ieee754/index.js
789 B	src/scenes/ChunkLoadErrorBoundary.tsx
762 B	src/index.tsx

Largest files eagerly shipped from src/scenes/AuthenticatedShell.tsx

Size	File
281.3 KiB	../node_modules/.pnpm/posthog-js@1.404.0/node_modules/posthog-js/dist/rrweb.js
267.7 KiB	../node_modules/.pnpm/@posthog+icons@0.38.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
235.5 KiB	src/taxonomy/core-filter-definitions-by-group.json
223.2 KiB	../node_modules/.pnpm/posthog-js@1.404.0/node_modules/posthog-js/dist/module.js
164.0 KiB	src/queries/validators.js
154.3 KiB	../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
105.8 KiB	src/lib/api.ts
93.3 KiB	../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js
93.3 KiB	../packages/quill/packages/quill/dist/index.js

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Dist folder size — 🔺 +17.4 KiB (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 1333.88 MiB · 🔺 +17.4 KiB (+0.0%)

✅ Playwright — all passed

All tests passed.

View test results →

⚠️ Django migration SQL — 1 new migration to review

We've detected new migrations on this PR. Review the SQL output for each migration:

products/warehouse_sources/backend/migrations/0079_alter_externaldatasource_source_type_and_more.py

BEGIN;
--
-- Alter field source_type on externaldatasource
--
-- (no-op)
--
-- Alter field source_type on pendingsourcecredential
--
-- (no-op)
COMMIT;

Last updated: 2026-07-17 12:09 UTC (23e6463)

✅ Django migration risk — migration analysis complete

We've analyzed your migrations for potential risks.

Summary: 0 Safe | 1 Needs Review | 0 Blocked

⚠️ Needs Review

May have performance impact

warehouse_sources.0079_alter_externaldatasource_source_type_and_more
  └─ #1 ⚠️ AlterField
     Field alteration may cause table locks or data loss (check if changing type or constraints)
     model: externaldatasource, field: source_type, field_type: CharField
  └─ #2 ⚠️ AlterField
     Field alteration may cause table locks or data loss (check if changing type or constraints)
     model: pendingsourcecredential, field: source_type, field_type: CharField

Last updated: 2026-07-17 12:09 UTC (23e6463)

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Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-07-17 12:59 UTC	Run
prod-us	✅ Deployed	2026-07-17 13:16 UTC	Run
prod-eu	✅ Deployed	2026-07-17 13:14 UTC	Run