Add some network, database diagnostics to the App

[MattG57]

Enable lightweight profiling (safe for production):

db.setProfilingLevel(1, { slowms: 100 }) // captures ops > 100ms
Then query the profiler periodically:

db.system.profile.find({ millis: { $gt: 100 } }).sort({ ts: -1 }).limit(5).pretty()
Useful fields:

ns (namespace: e.g., mydb.users)

op (operation: query, update, etc.)

query or command

millis

planSummary