[Enhancement] SQL: Chats, Average waiting time (min)

[JaanikaTalvistu]

MODULE: Analytics
SCOPE: Chat
SQL:

• DSL/Resql/analytics/POST/chat-avg-waiting-time.sql
• DSL/Resql/analytics/POST/chat-median-waiting-time.sql

Acceptance Criteria

• Counted chats need to have an ENDED status (as-is).
• Only unique chats are taken into account (as-is).
• Calculation is from the last Bürokratt message until a CSA picks up the chat (as-is).
• Average and median is used (as-is).
• Test chats are excluded (as-is).

[JaanikaTalvistu]

Checked, nothing to add or adjust.