When a connection drops and the node attempts to reconnect within the
same second, the `last_attempt` timestamp written to the database is
identitcal to the `last_success` timestamp due to the Unix time (seconds)
precision loss.
The `maintain_connections` logic filters eligible peers using the
condition `last_success >= last_attempt`. Because the truncated
timestamps are equal, this evaluates to true, causing the node to
bypass the `CONNECTION_RETRY_DELTA` backoff.
If the OS instantly rejects the dial attempt (e.g. `EHOSTUNREACH`),
the node synchronously queues another connection attempt. This traps
the reactor in an infinite `while` loop.
Changing the condition to `last_success > last_attempt` ensures that a
failed attempt in the same second correctly evaluates to false, forcing
the node to respect the backoff timer and breaking the loop.
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