Add SupersetService.import_dashboard for provisioning standard dashboards

[roboton]

Why

Part of the standardized-metrics work (design doc): orgs that enable the dbt_taf_metrics package should get the canned Survey Operations / Chat Engagement dashboards (DalgoT4D/dalgo-dashboard-templates) imported into their Superset automatically. SupersetService already has login/CSRF/retry plumbing but no import capability — this adds it.

What

• SupersetService.import_dashboard(bundle_zip, passwords=None, overwrite=True) — wraps POST /api/v1/dashboard/import/ with the service's existing _make_request_with_retry, CSRF token, Referer, and session-cookie handling. overwrite=True makes re-provisioning idempotent.
• The caller rewrites the bundle's databases/*.yaml sqlalchemy_uri and datasets/*.yaml schema to the org's warehouse before calling (reference implementation: scripts/import_dashboards.py in dalgo-dashboard-templates); passwords maps database yaml paths to connection passwords since Superset never exports them.
• Two unit tests in the existing TestSupersetService style; all 10 pass.

Follow-up (separate PR)

The enablement flow (POST /api/dalgo_metrics/enable/: ensure package in org repo's packages.yml → write vars → dbt run → import bundles), per docs/ddp_backend_integration.md.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added support for importing dashboard bundles into Superset.
  • Dashboard imports can overwrite existing content and include password mappings.

• Bug Fixes

  • Improved dashboard import requests with authentication, CSRF protection, and session handling.

• Tests

  • Added coverage for successful imports, uploaded bundles, overwrite behavior, password handling, and default settings.

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Supersedes #1426 (reopened from a fork per contribution workflow).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0df51362-0702-41a4-99c1-a64ff3be2c55

📥 Commits

Reviewing files that changed from the base of the PR and between 82c019d and d33c57d.

📒 Files selected for processing (2)

• ddpui/services/superset_service.py
• ddpui/tests/services/test_superset_service.py

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Walkthrough

SupersetService adds dashboard bundle import support using authenticated multipart requests, with CSRF/session handling and configurable overwrite/password fields. Unit tests cover configured values and defaults.

Changes

Superset dashboard import

Layer / File(s)	Summary
Dashboard import request flow ddpui/services/superset_service.py, ddpui/tests/services/test_superset_service.py	import_dashboard authenticates with Superset, uploads the zip bundle with JSON-encoded options, returns the response payload, and has tests for configured and default request values.

Estimated code review effort: 2 (Simple) | ~15 minutes

Sequence Diagram(s)

sequenceDiagram
  participant SupersetService
  participant SupersetAuth
  participant SupersetAPI
  SupersetService->>SupersetAuth: Get access token and CSRF/session credentials
  SupersetAuth-->>SupersetService: Return authentication values
  SupersetService->>SupersetAPI: POST multipart dashboard bundle and import options
  SupersetAPI-->>SupersetService: Return JSON response

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the new SupersetService.import_dashboard capability and matches the main change in the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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