Just curious what that entry really means
The "first seen" is self-descriptive, it's the time that blocktrail first saw the transaction. This was went it was first made. The "relay" time is the *last* time it saw it. Wallets like bitcoin core will continually rebroadcast transactions (every 24h?) so that the network doesn't forget about it (most nodes expire mempool transactions after 48-72h). In your case, this is the opposite of what you want (I guess they forgot to `abandontransaction` on it).
The simplest solution would be to use CPFP to push the transaction through. Either you could do that (using the output they sent to) or moneypot could do it (using the change address) and it would confirm with ~30 minutes or so
I personally have attempted to abandon the transaction. The RPC states that the transaction is not eligible for abandonment.
The user above's account has been credited. I believe his question was more out of curiosity.