- Implement UpgradeSubscriptionUseCase (Free→Pro→Enterprise)
- Prevent downgrades (must use cancel to return to Free)
- Auto-set quotas and expiration date on upgrade
- Implement CancelSubscriptionUseCase to downgrade to Free
- Only workspace owner can manage subscription
- Add 8 comprehensive unit tests (all passed)
Phase 4 Task 21/68 completed
- Implement ListMembersUseCase to get all workspace members
- Return member info with user details (username, email, display_name)
- Show role, inviter, and join time for each member
- Only workspace members can view member list
- Add 6 comprehensive unit tests (all passed)
Phase 4 Task 18/68 completed
- Implement ListWorkspacesUseCase to get user's all workspaces
- Return workspace info with user's role and member count
- Implement GetWorkspaceDetailUseCase with permission check
- Show detailed subscription and storage info
- Verify user is member before showing details
- Add 8 comprehensive unit tests (all passed)
Phase 4 Task 17/68 completed
- Implement UpdateMemberRoleUseCase with role-based permission
- Owner/Admin can change roles, but Admin cannot change other Admins
- Cannot change owner's role or change your own role
- Cannot change to owner role (owner is unique)
- Validate role not already assigned
- Add 8 comprehensive unit tests (all passed)
Phase 4 Task 16/68 completed
- Implement AcceptInvitationUseCase with validation
- Check invitation status, expiration, and email match
- Auto-create WorkspaceMember on accept
- Handle case when user is already a member
- Implement DeclineInvitationUseCase to reject invitations
- Update invitation status (accepted/declined/expired)
- Add 9 comprehensive unit tests (all passed)
Phase 4 Task 14/68 completed
- Implement InviteMemberUseCase with role-based permission check
- Only owner/admin can invite members (not regular members)
- Cannot invite as owner (owner is unique per workspace)
- Check for duplicate invitations and existing members
- Generate invitation token with 7-day expiration
- Send invitation email with accept link
- Add 7 comprehensive unit tests (all passed)
Phase 4 Task 13/68 completed
- Implement CreateWorkspaceUseCase with subscription plan support
- Auto-configure quotas based on plan (free/pro/enterprise)
- Auto-create owner membership record on workspace creation
- Validate workspace name (required, max 100 chars)
- Validate owner user exists before creation
- Add 7 comprehensive unit tests (all passed)
Phase 4 Task 12/68 completed
- Implement LoginUseCase with password verification and JWT token generation
- Generate user_auth token (without workspace) for initial login
- Create session with refresh_token in Redis
- Track last_login_at and last_login_ip
- Implement LogoutUseCase for single device or all devices
- Add RefreshTokenUseCase placeholder (to be implemented)
- Add 9 comprehensive unit tests (all passed)
Phase 4 Task 7/68 completed
- Implement EmailService class with configurable SMTP
- Support verification/password-reset/invitation email templates
- Support HTML and plain text fallback
- Support CC/BCC recipients
- Add 8 comprehensive unit tests with Mock SMTP (all passed)
Phase 4 Task 4/68 completed
- Implement SessionStore class with Redis backend
- Support save/get/delete session and refresh_token
- Support user multi-device sessions management
- Add last_active tracking and force logout all devices
- Add 10 comprehensive unit tests with Mock Redis (all passed)
- Install redis dependency
Phase 4 Task 3/68 completed
- Implement JWTService class with access_token and refresh_token support
- Add token type validation (access vs refresh)
- Add comprehensive unit tests (9 tests all passed)
- Install PyJWT dependency
Phase 4 Task 1/68 completed
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