complete codex docs

docs/modules/mysql.md

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+# MySQL
+
+## Purpose
+
+MySQL hosting/admin module for servers and databases.
+
+## Current Status
+
+- Functional
+- Future-facing
+
+## Dependencies
+
+- MySQL service setup
+- server assignment
+
+## Database Tables
+
+- `mysql_servers`
+- `mysql_databases`
+
+## Agent Interaction
+
+- indirect service provisioning
+
+## User Workflow
+
+- create/manage databases when enabled
+
+## Admin Workflow
+
+- configure MySQL servers and permissions
+
+## Security Concerns
+
+- database credentials and privilege strings
+
+## Known Issues
+
+- not a central focus of the current product line
+
+## Missing Functionality
+
+- clearer customer-facing DB hosting UX
+
+## Suggested Future Improvements
+
+- improve if DB hosting is part of the offering
+
+## Recommendation
+
+- Keep / Future
+