X_FEATURE_REQUIRED
Means
x g query or x g backfill named no slice to read
Typical cause
A read and a sweep read an existing table, and nothing but x g resource or x g entity creates one: with no --feature and no slice of that name, the generator would have written an entity and a migration nobody asked for
Fix
x help g --json # then the query generator with --feature <slice>, or the resource generator for a new table