The optional SQL directory contained a single PostgreSQL script with no
clear organisation. As we now have scripts for both PostgreSQL and MSSQL,
and multiple test scenarios (message generation, room creation, performance
testing), a clearer structure is needed.
Reorganises into postgresql/ and mssql/ subdirectories with descriptive
filenames that indicate purpose rather than execution order. Adds README
documenting available scripts and usage patterns.
Key scripts preserved:
- 410k message generator (PostgreSQL + MSSQL)
- 50 room creator with message redistribution (PostgreSQL + MSSQL)
- 10,000 minimal rooms for scale testing (PostgreSQL)
- 200 rooms with realistic affiliations and messages (PostgreSQL)
- Worker count configuration template (PostgreSQL)
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