chat_message bytes, measured with
SQLite JSON aggregates over the stored rows (not by deserializing them).
The extension keys reported individually are a fixed allowlist — the
map’s key set is bounded and stable so consumers can use the keys as
metric dimensions; every other key is summed into other.
Each figure is the byte length of the value SQLite extracts at that path:
for a string value, the decoded UTF-8 text (no quotes or escapes); for an
array or object, its minified JSON. So the buckets are approximations of
the stored bytes, not exact slices of them, and they add up to somewhat
less than payload_bytes (field names, delimiters and escaping are not
attributed).