Tag for notify on top up an expired account

Maybe renew a customer when they top up

If they are expired and they top up, ask sgx-jmp to check if they and registered
and bill/renew them.

Tag settled_after NOT NULL

Require settled_after to be NOT NULL

Sqitch tag for settled_after

Add settled_after to transactions table

invites.rewarded_at

Tag for default rate for customers with no plan

Customer with no plan gets highest matching rate

Since we don't know their plan, be safe and pick the highest rate.  This means
we can still get a sense of Transitional users' usage instead of not knowing at all.

Fix for cdr_with_charge performance

Call limits and billing rollout tag

Allow check_and_notify_low_balance to be called outside of trigger

For use from, eg, jmp-pay

NOTIFY on low balance

This will be picked up by the LISTEN in sgx-jmp to auto-top-up or notify the
customer of low balance.

Do not charge for voicemail

Need redis for CI now

Do not bill over user limit without consent

If the user has no configured limit in Redis, limit is 0
If the CDR would cost less than their limit, bill normally
If they have already spent more than within buffer of their limit, bill normally
Else, bill only enough to get up to their limit

Get customer data from Redis

Insert charge for CDR

Trigger to insert a transaction charging the customer for the amount owed for
an INSERTed CDR.

Function to compute the amount to charge a customer for a given cdr

This takes into account how much of their "included" minute credit has already
been used in the calendar month.

Store plans data in a table

Ideally this would come via FDW, but for now we can easily have a script push to
this table from the source of truth.