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Node.js on Railway. Runs every ~60s per pool: 
1. Check/init reward state
2. Skip if no fees
3. Scan holders on-chain
4. Register new holders (2/tx)
5. Update all holders (4/tx)
6. Claim from Meteora
7. Deposit 81.25% to vault
8. Transfer 18.75% to treasury
Update all holders before depositing. Deposit changes reward-per-share — stale data means wrong distribution.

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CLI

node crank.js                       # All pools, once
node crank.js --loop --interval 60  # Loop
node crank.js --mint <address>      # One token