Idle in Transaction

I see that every once in a while I get an Idle in Transaction that never
ends. This eventually becames a problem, as this Idle in Transaction holds
AccessShareLocks. Even if it didn't, if I reach the maximum number of
transactions my application dies. Is there any way to know what the
transaction did in the past so that I can now which particular query causes
this problem within my application? Or at least a way to set a timeout to
this transactions? The ideal solution would be to avoid it from happening,
but at least a timeout would make it less dangerous.
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