fix agg head-lag: dead WETH/USDbC pool → active Uniswap V3 WETH/USDC on Base - #1413
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Root cause
`AggregatorHeadLagStale` fires on `chain="base"` every ~10-30min because the subscribed pool `0x4c36388be6f416a29c8d8eee81c771ce6be14b18` is WETH/USDbC (deprecated bridged legacy USDC on Base, ~$27k liquidity, ~17 swaps/hour). Poisson gaps > 5 min are structurally inevitable.
The WS routing was fine, Mobula labels correctly. Just a dying pool.
Fix
Swap both `headLagPools` and `fastTradePools` Base entry to Uniswap V3 WETH/USDC 0.05% `0xd0b53d9277642d899df5c87a3966a349a798f224`:
Same chain, same metric label `chain="base"`, just a real active pool.
Post-merge
Redeploy the 3 Railway aggregator services (Agg eu west / agg sgp / Aggregator east usa) so containers pick up the new binary.