feat(m7.2-D): drop transitional agent.db, add admin helpers #89

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sharang wants to merge 1 commits from feat/m7.2d-drop-legacy-db into feat/m7.2c-background-paths

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Sharang Parnerkar 08c4ec4cff feat(m7.2-D): drop transitional agent.db, add admin helpers
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Final slice of M7.2. Removes the transitional single-database handle
that M7.2-A introduced alongside the pool, so the compliance-agent
now has a single source of truth for storage: every code path obtains
a tenant-scoped Database from `agent.db_pool.for_tenant_id(...)` or
`for_tenant(&ctx)`. There is no shared "default" database anywhere.

Changes
- ComplianceAgent: `db: Database` field removed. ComplianceAgent::new
  now takes only `(config, db_pool)`. Verified by an earlier grep
  during M7.2-C that no remaining call site reads `agent.db`.
- main.rs: stops constructing the legacy Database. Only the pool is
  built at startup.
- TestServer: same — drops Database::connect/ensure_indexes, builds
  only the pool. cleanup() now drops every `<db_name>_*` per-tenant
  database (no longer touches a bare `<db_name>`).
- DatabasePool::list_tenant_db_names() — lists Mongo databases
  matching the pool's prefix. For admin endpoints + scheduler tenant
  enumeration in a future M7.3 (this PR keeps SCHEDULER_TENANT_IDS
  env config — registry integration is a separate concern).
- DatabasePool::drop_tenant(&str) — idempotent tenant offboarding.
  Drops the per-tenant database and evicts the in-memory `ensured`
  marker so a later re-provision re-runs ensure_indexes.

Test plan
- cargo fmt --all clean
- cargo clippy --workspace --exclude compliance-dashboard
  -- -D warnings clean
- cargo test -p compliance-core --lib — 7 pass
- cargo test -p compliance-agent --lib — 228 pass
- cargo test -p compliance-agent --test tenant_isolation — 6 pass
  including new `admin_helpers_list_and_drop_tenant_dbs`
- cargo test -p compliance-agent --test tenant_status_middleware
  — 6 pass

M7.2 closeout state after this lands
- M7.1 (auth + status) — done
- M7.2-A (pool) — done
- M7.2-B (handlers) — done
- M7.2-C (background paths) — done
- M7.2-D (legacy db removed, admin helpers) — done (this PR)
- Future M7.3: scheduler pulls tenants from tenant-registry instead
  of SCHEDULER_TENANT_IDS env; cross-tenant admin HTTP endpoints
  built on list_tenant_db_names / drop_tenant.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-17 15:05:27 +02:00