References: https://soprani.ca/todo/323
Signed-off-by: Amolith <amolith@secluded.site>

If rate is zero, then minutes remaining becomes infinite.
That's hard to express in json...

So instead I just leave the limits out, which downstream can interpret
as "unlimited".

Extend the later one

* sim-top-up:
  Cronjob to auto top up and renew and warn about data plan SIMs
  Get list of all SIMs from Keepgo
  Factor out identical part of keepgo requests
  Add newline in low balance notification with target
  Split direct sources/direct targets

This loads the whole list into memory for now, should be good until we get to
tens of thousands of SIMs.

Thus allowing multiple JIDs to be treated as "direct inputs" for a given number,
such as cronjobs sending notifications from support.

Instead of broadening the patterns, this relies on realizing that almost all
query formats either won't match when a state name is present, or will work when
that name is replaced by the code.  So just preprocess the query string to
replace state names with their code before pattern matching.

Special case for vanity pattern ~ which can really be anything at all so don't
process that.

If you use it with a blank search it pulls from a fallback list for now.

Put them in the right place and also check from the InviteCodes handler

* child-signup:
  Refactor CutomerPlan to use value semantics
  Allow setting parent during signup using a special referral code

Lookup any referral code to see if it is one for setting a parent, if so set the
parent when we set the plan.  In the invite code flow, reload customer and check
balance and if there is enough then we can bill customer and proceed, no need to
add more credit or another code.

Verify parent when setting to make sure it has the same currency as the child
plan at creation time (note that updating the parent plan in the future can
violate this, so be very careful if/when we allow for that!)