# Action History Feature - Risk Management Dashboard

## Overview
The Risk Management Dashboard now tracks and displays a complete action history for every transaction flagged by risk rules. This provides full audit trail showing status changes, who made them, when, and why.

## Features Implemented

### 1. Automatic Action History Initialization
- **When**: Every time a new risk rule hit is created
- **What**: A "Created" system action is automatically recorded in the metadata
- **Details captured**:
  - Timestamp: When the transaction was flagged
  - Action: "Created"
  - Initial Status: "Hold" (or whatever status is set)
  - By: "System" (no supervisor ID)
  - Notes: "Transaction flagged by risk rule"

### 2. Supervisor Action Tracking
- **When**: Any time a supervisor takes action on a transaction
- **What**: The action is appended to the history
- **Actions tracked**:
  - Request Docs (Hold → Requested Docs)
  - Mark Reviewed (Hold → Reviewed)
  - Release/Released (Hold → Released)
  - Approve (Reviewed → Approved)
  - Reject (Hold/Reviewed/Requested Docs → Rejected)
  - Escalate (escalation actions)

- **Details captured**:
  - Timestamp: When the action was taken
  - Action: The specific action taken
  - Status Change: Old status → New status
  - Supervisor ID: Who made the change
  - Supervisor Name: "Supervisor #{supervisor_id}"
  - Notes: Any notes provided by the supervisor

### 3. UI Display - Transaction Details Modal
- **Location**: Risk Management Dashboard → Click on any transaction row → Modal opens
- **Section**: "Action History" (appears below Transaction Details and Rule Information)
- **Display format**:
  - Chronological order (oldest to newest)
  - Each action shown as a card with:
    - Colored badge showing action type (Requested Docs = yellow, Approve = green, Reject = red)
    - Timestamp
    - Status change (e.g., "Hold → Rejected")
    - Supervisor who took the action
    - Any notes added
  - Icons for each action type (document, eye, check, x-circle)

### 4. Backward Compatibility
- **Legacy transactions**: Transactions created before this feature will show "No action history (legacy data)" or display current action if supervisor has taken action
- **New transactions**: All transactions created after this feature deployment will have full action history from creation onwards

## Technical Implementation

### Files Modified

1. **apps/risk_core/lib/risk_core/context.ex**
   - **Lines 1857-1885**: Modified `create_risk_rule_hit/1` to initialize action history
   - **Lines 2006-2053**: Modified `update_risk_rule_hit_action/5` to append to action history
   - **Lines 2092-2120**: Added `get_hit_action_history/1` function to retrieve and format history

2. **apps/platform_web/lib/platform_web/live/risk_management_live/supervisor_dashboard.ex**
   - **Line 258**: Loads action history when transaction is selected for viewing

3. **apps/platform_web/lib/platform_web/live/risk_management_live/supervisor_dashboard.html.heex**
   - **Lines 875-940**: Action History display section in transaction details modal

### Data Structure

Action history is stored in the `metadata` JSON column of the `risk_rule_hits` table:

```elixir
metadata: %{
  "action_history" => [
    %{
      "timestamp" => "2026-03-09T07:38:41.228370Z",
      "action" => "Created",
      "from_status" => nil,
      "to_status" => "Hold",
      "supervisor_id" => nil,
      "supervisor_name" => "System",
      "notes" => "Transaction flagged by risk rule"
    },
    %{
      "timestamp" => "2026-03-09T07:40:15.123456Z",
      "action" => "Request Docs",
      "from_status" => "Hold",
      "to_status" => "Requested Docs",
      "supervisor_id" => 1,
      "supervisor_name" => "Supervisor #1",
      "notes" => "Please provide transaction receipt"
    },
    %{
      "timestamp" => "2026-03-09T08:15:30.789012Z",
      "action" => "Reject",
      "from_status" => "Requested Docs",
      "to_status" => "Rejected",
      "supervisor_id" => 2,
      "supervisor_name" => "Supervisor #2",
      "notes" => "Fraudulent transaction confirmed"
    }
  ],
  # Other metadata fields...
}
```

## Testing

### Demo Scripts Provided

1. **demo_action_history.exs**
   - Demonstrates the complete action history feature
   - Finds a recent risk hit and simulates supervisor actions
   - Shows how the timeline builds up with each action
   - Run with: `mix run demo_action_history.exs`

2. **test_new_risk_hit.exs**
   - Tests automatic initialization of action history for new risk hits
   - Creates a test risk hit, verifies "Created" action exists
   - Cleans up test data automatically
   - Run with: `mix run test_new_risk_hit.exs`

3. **check_new_hits_action_history.exs**
   - Checks recent risk hits for action history
   - Shows which transactions have history and which are legacy
   - Run with: `mix run check_new_hits_action_history.exs`

### Test Results
```
✅ New risk hits automatically get 'Created' system action
✅ Supervisor actions are appended to history with all details
✅ get_hit_action_history/1 retrieves and formats history correctly
✅ UI displays action history timeline in modal
✅ Backward compatibility maintained for legacy data
```

## Usage Examples

### For Supervisors
1. Open Risk Management Dashboard
2. See a flagged transaction in the table
3. Click on the row to view details
4. Modal opens showing:
   - Transaction details (amount, card, payment method)
   - Rule that was triggered
   - **Action History** showing complete timeline
5. Take action (Request Docs, Approve, Reject)
6. Action is recorded and appears in history immediately

### For Administrators/Auditors
- Full audit trail available for every transaction
- Can see exactly when transaction was flagged
- Track all supervisor actions chronologically
- View status progression (Hold → Request Docs → Reviewed → Approved)
- See which supervisor made each decision and their notes

## Database Schema

**NO SCHEMA CHANGES REQUIRED**

This feature uses the existing `metadata` JSON column in the `risk_rule_hits` table. No database migrations needed.

Existing table: `risk_rule_hits`
- `id` (primary key)
- `transaction_id`
- `transaction_type` (QR or POS)
- `merchant_id`
- `status`
- `triggered_at`
- `supervisor_id`
- `action_taken`
- `action_at`
- `notes`
- `metadata` (JSON) - **Action history stored here**
- `rule_id`
- `inserted_at`
- `updated_at`

## Benefits

1. **Complete Audit Trail**: Every action on a transaction is tracked
2. **Accountability**: See exactly who made each decision
3. **Transparency**: Clear timeline of events for disputed transactions
4. **Compliance**: Meets audit requirements for financial transaction monitoring
5. **Investigation Support**: Helps trace back decision-making process
6. **No DB Changes**: Uses existing metadata column (zero migration risk)

## Future Enhancements (Optional)

- Export action history to PDF/Excel
- Filter transactions by supervisor actions
- Metrics dashboard showing supervisor action patterns
- Email notifications when actions are taken
- Link to supervisor profile for more details
- Add ability to "undo" last action (within time limit)

## Support

For questions or issues with the action history feature:
1. Check demo scripts to see working examples
2. Review this documentation
3. Check the Risk Management Dashboard modal display
4. Verify action_history exists in risk_rule_hits.metadata column

## Version History

- **v1.0** (2026-03-09): Initial implementation
  - Automatic "Created" action on new risk hits
  - Supervisor action tracking (Request Docs, Approve, Reject, etc.)
  - UI display in transaction details modal
  - Backward compatibility for legacy data