feature: the key of a credential store may be a path of keys, so stores of several kinds share one object of config.json.

ADR.md

@@ -76,3 +76,22 @@ Consequences: Without the key no secret can be saved or used, and a changed key
 secrets unusable until they are entered again. SHA-256 does not slow down guessing a weak key, so
 the key has to be long and random. Anyone who reaches the routes can replace credentials, as the
 applications have no authentication.
+
+## ADR-4: The key of a credential store is a path, so related stores share one object
+
+Status: Accepted
+
+Context: sql-query-webui keeps connection profiles of PostgreSQL and of SQL Server. As stores of
+top-level keys, the keys have to carry the kind in their names, and a key such as `connections`
+does not say which kind it holds once there are several.
+
+Decision: The key of a store is a key of `config.json` or a path of keys separated by dots, such
+as `connections.pg` and `connections.mssql`. The store reads the list at the path, reports its
+problems by `<path>.<index>.<field>`, and a write sets the list at the path, creating the objects
+of the path that are missing, or are not objects, and keeping their other keys, so stores of one
+object can be written one after the other. The kind stays the store's, not a field of an entry
+(ADR-3).
+
+Consequences: A key of `config.json` holding a dot cannot be the key of a store. A single key
+reads and writes as before, so applications of one-key stores need no change. The application
+checks the object of a path, such as the keys it allows in it, itself.