harb/IMPLEMENTATION_SUMMARY.md

Ponder LM Indexing - Backend Metrics Implementation

Branch: feat/ponder-lm-indexing
Commit: 3ec9bfb
Date: 2026-02-16

Summary

Successfully implemented backend indexing for three key protocol metrics:

1. ETH Reserve Growth (7d) ✅
2. Floor Price per KRK ✅
3. Trading Fees (7d) ⚠️ Infrastructure ready, awaiting implementation

Changes Made

1. Schema Updates (ponder.schema.ts)

Extended stats Table

Added fields to track new metrics:

// 7-day ETH reserve growth metrics
ethReserve7dAgo: bigint (nullable)
ethReserveGrowthBps: int (nullable) // basis points

// 7-day trading fees earned
feesEarned7dEth: bigint (default 0n)
feesEarned7dKrk: bigint (default 0n)
feesLastUpdated: bigint (nullable)

// Floor price metrics
floorTick: int (nullable)
floorPriceWei: bigint (nullable) // wei per KRK
currentPriceWei: bigint (nullable)
floorDistanceBps: int (nullable) // distance from floor in bps

New Tables

• ethReserveHistory: Tracks ETH balance over time for 7-day growth calculations

  • id (string): block_logIndex format
  • timestamp (bigint): event timestamp
  • ethBalance (bigint): ETH reserve at that time

• feeHistory: Infrastructure for fee tracking (ready for Collect events)

  • id (string): block_logIndex format
  • timestamp (bigint): event timestamp
  • ethFees (bigint): ETH fees collected
  • krkFees (bigint): KRK fees collected

2. Handler Updates (src/lm.ts)

New Helper Functions

• priceFromTick(tick: number): bigint

  • Calculates price in wei per KRK from Uniswap V3 tick
  • Uses formula: price = 1.0001^tick
  • Accounts for WETH as token0 in the pool
  • Returns wei-denominated price for precision

• calculateBps(newValue: bigint, oldValue: bigint): number

  • Calculates basis points difference: (new - old) / old * 10000
  • Used for growth percentages and distance metrics

Updated Event Handlers

EthScarcity and EthAbundance Handlers:

1. Record ETH Reserve History

   • Insert ethBalance into ethReserveHistory table
   • Enables time-series analysis

2. Calculate 7-Day Growth

   • Look back 7 days in ethReserveHistory
   • Find oldest record within window
   • Calculate growth in basis points
   • Updates: ethReserve7dAgo, ethReserveGrowthBps

3. Calculate Floor Price

   • Uses vwapTick from event as floor tick
   • Converts to wei per KRK using priceFromTick()
   • Updates: floorTick, floorPriceWei

4. Calculate Current Price

   • Uses currentTick from event
   • Converts to wei per KRK
   • Updates: currentPriceWei

5. Calculate Floor Distance

   • Computes distance from floor in basis points
   • Formula: (currentPrice - floorPrice) / floorPrice * 10000
   • Updates: floorDistanceBps

Recentered Handler:

• Cleaned up: removed direct ETH balance reading
• Now relies on EthScarcity/EthAbundance events for balance data
• Maintains counter updates for recenter tracking

Fee Tracking Status

Current State: Infrastructure Ready ⚠️

The fee tracking infrastructure is in place but not yet populated with data:

• feeHistory table exists in schema
• feesEarned7dEth and feesEarned7dKrk fields default to 0n
• feesLastUpdated field available

Implementation Options

Documented two approaches in code:

Option 1: Uniswap V3 Pool Collect Events (Recommended)

Pros:

• Accurate fee data directly from pool
• Clean separation of concerns

Cons:

• Requires adding UniswapV3Pool contract to ponder.config.ts
• Forces a full re-sync from startBlock (significant downtime)

Implementation Steps:

1. Add pool contract to ponder.config.ts:

   UniswapV3Pool: {
     abi: UniswapV3PoolAbi,
     chain: NETWORK,
     address: '<pool-address>',
     startBlock: selectedNetwork.contracts.startBlock,
   }
   

2. Add handler for Collect(address owner, int24 tickLower, int24 tickUpper, uint128 amount0, uint128 amount1)
3. Filter for LM contract as owner
4. Record to feeHistory table
5. Calculate 7-day rolling totals

Option 2: Derive from ETH Balance Changes

Pros:

• No config changes needed
• No resync required

Cons:

• Less accurate (hard to isolate fees from other balance changes)
• More complex logic
• Potential edge cases

Recommendation

Wait for next planned resync or maintenance window to implement Option 1 (Collect events). This provides the most accurate and maintainable solution.

Verification

All success criteria met:

✅ Schema compiles (valid TypeScript)

npm run build
# ✓ Wrote ponder-env.d.ts

✅ New fields added to stats

• ethReserve7dAgo, ethReserveGrowthBps
• feesEarned7dEth, feesEarned7dKrk, feesLastUpdated
• floorTick, floorPriceWei, currentPriceWei, floorDistanceBps

✅ EthScarcity/EthAbundance handlers updated

• Record history to ethReserveHistory
• Calculate 7-day growth
• Calculate floor and current prices
• Calculate floor distance

✅ Fee tracking infrastructure

• feeHistory table created
• Fee fields in stats table
• Documentation for implementation approaches

✅ Git commit with --no-verify

git log -1 --oneline
# 3ec9bfb feat(ponder): add ETH reserve growth, floor price, and fee tracking metrics

✅ Linting passes

npm run lint
# (no errors)

Testing Recommendations

1. Deploy to staging and verify:

   • ethReserveHistory table populates on Scarcity/Abundance events
   • 7-day growth calculates correctly after 7 days of data
   • Floor price calculations match expected values
   • Current price tracks tick movements

2. API Integration:

   • Query stats table for dashboard metrics
   • Use ethReserveHistory for time-series charts
   • Monitor for null values in first 7 days (expected)

3. Future Fee Implementation:

   • Plan maintenance window for resync
   • Test Collect event handler on local fork first
   • Verify fee calculations match pool data

Technical Notes

Price Calculation Details

• Formula: price = 1.0001^tick
• Token Order: WETH (0x4200...0006) < KRK (0xff196f...) → WETH is token0
• Conversion: Price in KRK/WETH → invert to get wei per KRK
• Precision: Uses BigInt for wei-level accuracy, floating point only for tick math

7-Day Lookback Strategy

• Simple approach: Query ethReserveHistory for oldest record ≥ 7 days ago
• Performance: Acceptable given low event volume (~50-200 recenters/week)
• Edge case: Returns null if less than 7 days of history exists

Data Consistency

• Both EthScarcity and EthAbundance handlers implement identical logic
• Ensures consistent metrics regardless of recenter direction
• History records use block_logIndex format for unique IDs

Files Modified

• /home/debian/harb/services/ponder/ponder.schema.ts (+50 lines)
• /home/debian/harb/services/ponder/src/lm.ts (+139 lines, -32 lines)

Total: +157 lines, comprehensive implementation with documentation.

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Status: ✅ Ready for staging deployment
Next Steps: Monitor metrics in staging, plan fee implementation during next maintenance window