In Monero's early history, many transactions did not include any decoys. It was extremely clear that these outputs were spent.
Could Monero prune these known spent outputs?
Here is an example transaction from block 100000: 9c3c0086ef9aa98f370dac303c5dca109678bf95c9e4252e103dab16dce46fa8
It has a ringsize of 1 and 5 inputs:
2192316b89c7a120a57f24f1d87fac4ad1b39df70c861fe8ec16dad8e9038f61
b255b6c7ae1a10a4673320f32599cb972f1acc63f00abb02d331d6482fcea8c2
5dffd991c54e38a7374d6e54a0be5b6c6c98cae0fa00558b57a0c878f7f258e1
2c74d3187d7576f469928cead3a80e0c855784fea05d086aae3e83a72d56e25f
b41f74b78aaf1c07bda9926d630e06187b5ca1f90e00d3dd23d41f26cc10b598
Since all of these outputs are known to be spent in this transaction, is it possible to prune/delete all record of these outputs and their key images? Are there any significant downsides to doing so?