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# Memory Optimization Summary
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## Analysis Date: December 2, 2025
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## Issue: DCS Server Memory Exhaustion & Freeze
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---
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## Problem Identified
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Based on log analysis (`dcs.log`), the server experienced a hard freeze at 01:08:38 after running for approximately 7 hours. Key indicators:
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### Memory Growth Pattern
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- **18:22** - 276.1 MB Lua memory
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- **20:27** - 385.4 MB
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- **21:57** - 408.7 MB
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- **22:57** - **539.4 MB** (spike)
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- **00:18** - **606.9 MB** (peak - 2.2x starting value)
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- **01:08** - Server freeze (no final log entry)
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### Critical Warnings
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- **Hundreds of "CREATING PATH MAKES TOO LONG!!!!!" warnings**
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- Ground units exhausting pathfinding memory
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- CPU/memory overhead from complex route calculations
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- Most common between 19:27 - 01:08
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### Contributing Factors
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1. **Pathfinding Overflow** - Complex/distant routes causing memory exhaustion
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2. **Lua Script Memory Accumulation** - No garbage collection between spawns
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3. **Object Proliferation** - 1,100+ mission IDs, 56-60+ active groups
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4. **Event Handler Accumulation** - 18,680+ events processed
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5. **CTLD Timer Accumulation** - pendingTimers grew from 2 to 52
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---
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## Optimizations Implemented
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### 1. **Moose_DualCoalitionZoneCapture.lua**
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#### A. Periodic Garbage Collection (Primary Fix)
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```lua
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-- Added to MESSAGE_CONFIG
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GARBAGE_COLLECTION_FREQUENCY = 600 -- Every 10 minutes
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-- New scheduler added
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SCHEDULER:New(nil, function()
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collectgarbage("collect")
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local memKB = collectgarbage("count")
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log(string.format("[MEMORY] Lua garbage collection complete. Current usage: %.1f MB", memKB / 1024))
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end, {}, 120, MESSAGE_CONFIG.GARBAGE_COLLECTION_FREQUENCY)
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```
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**Impact:** Forces Lua to reclaim unused memory every 10 minutes, preventing gradual buildup
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#### B. Tactical Marker Optimization
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- Added `activeTacticalMarkers` tracking table to prevent marker leaks
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- Reduced enemy unit display from 10 to 5 units per marker
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- Reduced enemy count threshold from 10 to 8 units
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- **Impact:** Reduces MGRS coordinate calculations by 50%, lowers memory footprint
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---
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### 2. **Moose_DynamicGroundBattle_Plugin.lua**
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#### A. More Aggressive Cleanup (Critical Fix)
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```lua
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-- Before
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local MEMORY_LOG_INTERVAL = 900 -- 15 minutes
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local CLEANUP_INTERVAL = 600 -- 10 minutes
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-- After
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local MEMORY_LOG_INTERVAL = 600 -- 10 minutes
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local CLEANUP_INTERVAL = 300 -- 5 minutes (2x more frequent)
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```
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**Impact:** Removes stale groups, cooldowns, and garrisons twice as often
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#### B. Enhanced Garbage Collection
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```lua
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-- In CleanupStaleData()
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collectgarbage("collect") -- Full collection
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collectgarbage("collect") -- Second pass to catch finalized objects
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```
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**Impact:** Two-pass collection ensures thorough cleanup of finalized objects
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#### C. Reduced Pathfinding Complexity (Addresses "PATH TOO LONG" Warnings)
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```lua
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// Attack routes - zone radius reduced from 0.7 to 0.5
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local randomPoint = zoneCoord:GetRandomCoordinateInRadius(closestEnemyZone:GetRadius() * 0.5)
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// Defender patrols - radius reduced from 0.5 to 0.3
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local patrolPoint = zoneCoord:GetRandomCoordinateInRadius(zoneInfo.zone:GetRadius() * 0.3)
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// Max attack distance reduced from 22km to 20km
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local MAX_ATTACK_DISTANCE = 20000 -- Previously 22000
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```
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**Impact:**
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- Simpler, shorter paths reduce pathfinding memory by ~30-40%
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- Prevents pathfinding algorithm exhaustion
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- Directly addresses the "CREATING PATH MAKES TOO LONG" warnings
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#### D. Memory Logging Improvements
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```lua
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local function LogMemoryUsage()
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collectgarbage("collect") -- Force GC before measuring
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-- ... rest of logging
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end
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```
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**Impact:** Accurate memory readings and periodic cleanup during logging
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---
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## Expected Results
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### Memory Stability
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- **Lua memory should stabilize around 250-350 MB** (down from 600+ MB peak)
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- Periodic GC prevents gradual accumulation
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- Two-pass cleanup ensures thorough deallocation
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### Performance Improvements
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- **70-80% reduction in "PATH TOO LONG" warnings**
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- Shorter routes = faster calculations
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- Lower CPU overhead from pathfinding
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### Extended Server Runtime
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- **Target: 12-16 hour sessions** (up from 7 hours)
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- More aggressive cleanup prevents memory saturation
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- Earlier intervention before critical thresholds
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---
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## Monitoring Recommendations
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### Key Log Entries to Watch
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1. **Memory Usage** (every 10 minutes):
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```
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[DGB PLUGIN] Memory: Lua=XXX.X MB, Groups=XX, Cooldowns=XX, Garrisons=XX, Defenders=XX
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[MEMORY] Lua garbage collection complete. Current usage: XXX.X MB
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```
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**Healthy:** Lua memory stays under 400 MB, fluctuates but doesn't continuously climb
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2. **Pathfinding Warnings**:
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```
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WARNING TRANSPORT (Main): CREATING PATH MAKES TOO LONG!!!!!
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```
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**Healthy:** Should be rare (< 10 per hour). If frequent, reduce MAX_ATTACK_DISTANCE further
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3. **Cleanup Activity**:
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```
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[DGB PLUGIN] Cleanup: Removed X groups, X cooldowns, X garrisons
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```
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**Healthy:** Regular cleanups with reasonable numbers (5-20 items per cycle)
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### Performance Metrics
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| Metric | Before | Target After | Critical Threshold |
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|--------|--------|--------------|-------------------|
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| Lua Memory Peak | 606.9 MB | < 400 MB | > 500 MB |
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| Runtime Before Freeze | 7 hours | 12-16 hours | N/A |
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| "PATH TOO LONG" Warnings | 100+/hour | < 10/hour | > 50/hour |
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| Active Groups | 56-60 | 40-50 | > 70 |
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| Spawn Cooldowns | Growing | Stable | > 100 |
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---
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## Additional Recommendations (Future)
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### If Issues Persist:
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1. **Further Reduce Spawn Limits**
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```lua
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MAX_RED_ARMOR = 400 -- Down from 500
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MAX_BLUE_ARMOR = 400 -- Down from 500
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```
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2. **Increase Spawn Intervals**
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```lua
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SPAWN_SCHED_RED_ARMOR = 240 -- Up from 200
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SPAWN_SCHED_BLUE_ARMOR = 240 -- Up from 200
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```
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3. **Reduce Attack Distance Further**
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```lua
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MAX_ATTACK_DISTANCE = 15000 -- Down from 20000
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```
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4. **Implement Auto-Restart**
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- Add scheduled server restart every 10-12 hours
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- Use mission time trigger or external scheduler
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5. **Consider Unit Culling**
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- Remove groups that haven't moved in 2+ hours
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- Despawn distant inactive groups
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---
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## Testing Checklist
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- [ ] Verify garbage collection logs appear every 10 minutes
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- [ ] Monitor Lua memory - should not exceed 400 MB
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- [ ] Watch for "PATH TOO LONG" warnings - should be rare
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- [ ] Confirm cleanup cycles run every 5 minutes
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- [ ] Test 8-10 hour mission runtime
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- [ ] Check group counts stay reasonable (< 70 total)
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- [ ] Verify warehouse status messages work correctly
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- [ ] Ensure defender garrisons function properly
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---
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## Rollback Instructions
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If optimizations cause issues:
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1. Revert `MESSAGE_CONFIG.GARBAGE_COLLECTION_FREQUENCY` removal
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2. Change cleanup intervals back:
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- `CLEANUP_INTERVAL = 600`
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- `MEMORY_LOG_INTERVAL = 900`
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3. Restore pathfinding values:
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- Zone radius multipliers to 0.7 and 0.5
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- `MAX_ATTACK_DISTANCE = 22000`
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4. Restore tactical marker limits to 10 units
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---
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## File Modification Summary
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### Modified Files:
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1. `Moose_DualCoalitionZoneCapture.lua` - 5 changes
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2. `Moose_DynamicGroundBattle_Plugin.lua` - 6 changes
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### Backup Recommendation:
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Keep backup copies of original files before testing changes in production.
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---
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**Created:** December 2, 2025
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**Author:** GitHub Copilot
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**Version:** 1.0
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