gcp-hockey-results/motm_app/SQUAD_HISTORY_FEATURE.md

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# Squad History Feature
## Overview
The squad history feature preserves historical match squad data when resetting for a new match. Previously, when the squad was reset, all player data was lost. Now it's automatically archived to a dedicated history table.
## What Changed
### Before
- Squad reset would delete or overwrite previous squad data
- No way to view who played in previous matches
- Historical squad information was lost forever
### After
- Squad data is **automatically archived** before being cleared
- Complete historical record preserved with match date and fixture number
- New admin interface to view all historical squads
- Easy lookup of who played in any previous match
## How It Works
### When You Reset the Squad
1. **Automatic Archival**: Before clearing the current squad, the system:
- Copies all players to the `squad_history` table
- Stores the match date and fixture number
- Records when the archive was created
2. **Clean Reset**: The current squad table is cleared for the new match
3. **Confirmation**: Shows how many players were archived
### Database Structure
**New Table: `squad_history`**
```sql
- id (primary key)
- player_number
- player_forenames
- player_surname
- player_nickname
- match_date
- fixture_number
- archived_at (timestamp)
```
## Using the Feature
### Resetting the Squad (with History)
1. Go to **Admin Dashboard****Match Squad Management**
2. Click **"Reset Squad"**
3. System automatically:
- Archives current squad with match details
- Clears squad for new match
- Shows confirmation message
### Viewing Squad History
1. Go to **Admin Dashboard****Squad History**
2. See summary of all historical squads
3. Click **"View Details"** on any fixture to see the full squad
4. Scroll to see detailed player lists for each match
## Migration
The migration has been **automatically completed**! ✅
The `squad_history` table was created successfully.
For future databases or if needed again:
```bash
python add_squad_history.py
```
## Features
**Automatic Archival**: No manual steps needed
**Complete Records**: All player details preserved
**Easy Navigation**: Summary view with drill-down details
**Match Context**: Linked to match date and fixture number
**Safe Reset**: Squad clearing only happens after successful archive
## Admin Interface
### Squad History Page Shows:
**Summary Table:**
- Fixture Number
- Match Date
- Player Count
- Quick view button
**Detailed View:**
- Full squad rosters grouped by match
- Player numbers, nicknames, and full names
- Archive timestamp for audit trail
## Benefits
1. **Historical Reference**: See who played in any match
2. **Team Analysis**: Track player participation over time
3. **Data Integrity**: No more lost squad data
4. **Audit Trail**: Know when squads were archived
5. **Reporting**: Export or analyze squad patterns
## Technical Details
### Files Modified
1. **`database.py`** - Added `SquadHistory` model
2. **`main.py`** - Updated reset function and added history route
3. **`templates/squad_history.html`** - New history viewing interface
4. **`add_squad_history.py`** - Migration script
### Safety Features
- Transaction-based: Archive completes before deletion
- Error handling: If archive fails, squad is not cleared
- Flash messages: Clear feedback on what happened
- Rollback capable: Can restore from history if needed
## Future Enhancements
Potential additions for future versions:
- Export squad history to CSV/Excel
- Compare squads between matches
- Player participation statistics
- Squad restoration from history
- Search/filter historical squads
- Visual squad timeline
---
**Implementation Date**: October 2025
**Status**: ✅ Active and Working