A	automatically-generated entry
s	to-be-shared
S	has-been-shared (twice: was marked s but hasn't been shared - s flag moved to related A entry)
c	to-be-confirmed (may appear twice, or in conjunction with C)
C	confirmed (may appear twice, or in conjunction with c)
p	protect from automated processing
x	to-be-(foreign-currency-)exchanged
X	has-been-exchanged (twice: has been exchanged but wasn't marked x)

splitdb:
generates A entries

entry:
generates {,s}{,c,C}{,c,C}{,p}{,x} entries

doshared -> shared -> shared1:
converts s to S
generates AS entries

exchange:
converts !sx to X
converts !s!x to XX
converts sx to XSS
generates AX
generates AXs