"""`ledger` — the economics pipeline (D-263).

Named for the implant app the player will use to browse markets, wealth and
transactions: the economic counterpart to what the Atlas is for topography.
Not `db`, which named a storage layer nobody looks at, and not `economics`,
which names a subject rather than the thing on screen.

Formerly `tooling/economy-db/` plus `tooling/schema_version.py` (T-1289). The
importer here is the SOLE generator of `server/data/systems.db`; its stamped
source set lives in `tooling/generator_sources.py`, which is why moving these
files changed the stamp and the move landed together with a regen.
"""