The working copy: the draft, else what posts.
slacktpl_…
Why the live version is not what posts; null when it is (or there is none).
What posts: the live version's blocks if valid, else the registry default.
DISABLED skips the post; for CUSTOMER, for every customer.
The status this row serves; '*' for a key with no status axis.
One Slack template variant as the posters and the editor read it: its
b2b.slack_templaterow merged with its registry entry. JSON-safe.