0.4.2 - Early implementation of SLMs. WIP.

docs/FIX_DEV_PERMISSIONS.md

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+# Fix DEV Database Permissions
+
+## The Problem
+
+SQLite needs write access to both the database file AND the directory it's in (to create temporary files like journals and WAL files).
+
+Currently:
+- ✅ Database file: `data-dev/seismo_fleet.db` - permissions fixed
+- ❌ Directory: `data-dev/` - still owned by root
+
+## The Fix
+
+Run this command to fix the directory ownership:
+
+```bash
+sudo chown -R serversdown:serversdown /home/serversdown/sfm/seismo-fleet-manager/data-dev/
+```
+
+Then run the migration again:
+
+```bash
+python3 scripts/migrate_dev_db.py
+```
+
+## Full Setup Commands
+
+Here's the complete sequence:
+
+```bash
+cd /home/serversdown/sfm/seismo-fleet-manager
+
+# Fix directory ownership (includes all files inside)
+sudo chown -R serversdown:serversdown data-dev/
+
+# Migrate schema
+python3 scripts/migrate_dev_db.py
+
+# Add test data
+python3 scripts/add_test_slms.py
+python3 scripts/add_test_modems.py
+```
+
+## Verify It Worked
+
+After running the migration, you should see:
+
+```
+Migrating DEV database to add SLM columns...
+============================================================
+✓ Added column: slm_host
+✓ Added column: slm_tcp_port
+✓ Added column: slm_model
+✓ Added column: slm_serial_number
+✓ Added column: slm_frequency_weighting
+✓ Added column: slm_time_weighting
+✓ Added column: slm_measurement_range
+✓ Added column: slm_last_check
+============================================================
+DEV database migration completed!
+```
+
+Then the test data scripts should work without errors!