Routes
Data model
footprint and footprint_filters on a Symbol are symbol metadata (which PCB
footprint(s) the symbol maps to) — not the same thing as the
Footprints platform.Categories
Symbols are classified into ~16 categories (power, mcu, analog, passive,
connector, logic, communication, sensor, display, ic, rf, memory,
battery, …). For display, power_symbol, graphical, and mechanical are merged into
“other”, and the other filter expands back to all three on the server. Counts come
from /api/categories at runtime.

