V16 adds wallet_ledger.billing_category, payg_shadow_charge.billing_category +
job_source, and pricing_policy_stripe_price.stripe_product_id (operator
populates manually). All adds are nullable so pre-V16 rows stay NULL — the
interceptor stamps the category for new rows.
PAYG stays on a single flat-priced Stripe meter forever; this axis is purely
for in-app breakdowns and analytics. The wallet_category_summary view
pre-groups debits by team / month / category for the dashboard widget.
BillingCategory enum lists BYPASSED first as the default sentinel; no
downstream relies on ordinal(). JPA mapping uses STRING so renames stay
backward-compatible.
Connor Yoh
c4d579ad4c