Bugs in array index in condition 3, possibly 1b in consolidate_database

[dgets]

if applicable_usages[cntr].timestamp - applicable_usages[cntr + 1].timestamp <= max_delta and \
    (applicable_usages[cntr].valid_entry and applicable_usages[cntr + 1].valid_entry):

is giving a list index out of range error (condition 3), and there were issues in condition 1b previously, though those may have been taken care of by a bit of code manipulation here.

This is the first time that I've run into this; previous data sets must not have had to consolidate any records in these conditionals.