eth: speed up active account transaction discovery#4168
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Incoming ETH transactions are currently only discovered during the regular Etherscan history sync, which runs every five minutes to stay conservative with API usage. That means a mined incoming transaction can remain invisible for minutes even though Ethereum blocks are produced much faster. Add a short-lived foreground activity lease so the backend can identify ETH accounts the user is actively viewing. While such a lease is active, cheaply probe the remote balance and trigger a targeted full account update only when the balance changes. This improves mined incoming transaction discovery without polling full transaction history for every account more often, and the existing five-minute full sync remains the fallback.
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Fix to an old issue: #837
Incoming ETH transactions are currently only discovered during the regular Etherscan history sync, which runs every five minutes to stay conservative with API usage. That means a mined incoming transaction can remain invisible for minutes even though Ethereum blocks are produced much faster.
Add a short-lived foreground activity lease so the backend can identify ETH accounts the user is actively viewing. While such a lease is active, cheaply probe the remote balance and trigger a targeted full account update only when the balance changes. This improves mined incoming transaction discovery without polling full transaction history for every account more often, and the existing five-minute full sync remains the fallback.