move regex into variable
implement data counts page
add new /data list API based on read/write token, remove references api
remove unused variable
return reasons why data list fetching failed
store hashes as bytea not text, to save space
simplify by removing refers_hash normalization

The storage savings on duplicated are not expected to be very high due
to most content being posted in one channel, or with a date or signature
present
parallelize data post async actions, cache write_key -> read_pkey lookup

Both aimed at improving performance as much as possible
write content to shasum as the chunks come in
build the content hex as each chunk is received, not all at the end