pub const BLOB_COLUMNS: &[(&str, &str)];Expand description
Every column that may name a vault blob by its SHA-256 – the files and
their versions, change request attachments, staged STEP imports and
upload sessions (the stored content, and the hashes the client announced
or started from). shape_signatures.sha256 is derived data and
branding_logos.sha256 the hash of bytes kept in the row; neither keeps a
blob alive. A test checks this list against the migrations.