Adds deerflow/persistence/service_account/{__init__,model}.py with
ServiceAccountRow:
- id: UUID36 PK
- workspace_id: FK workspaces ON DELETE CASCADE
- name: String(64)
- role: String(16) default "member" (Stage 0 lone value; Stage 2 RBAC)
- identity_mode: String(16) default "collapsed" — three states
"collapsed" / "external_passthrough" / "both"; Stage 1 API key
auth layer branches on this to decide whether each call writes
an external_users row
- status: String(16) default "active"
- created_by: FK users ON DELETE RESTRICT (must hand off / delete
SAs before removing their creator)
- created_at / updated_at (UTC, onupdate)
- Index idx_service_accounts_workspace (workspace_id, status)
Registers in deerflow/persistence/models/__init__.py so the engine's
side-effect import path picks it up for Base.metadata.create_all().
T8.1 test: insert_smoke writes a row through a session, reads it back,
asserts each column round-trips. SQLite ephemeral DB per test via
tmp_path, no Postgres required at this layer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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