Module filter-settings

Per-channel noise filter settings, stored in a LabJack config under sensor_settings.filters, keyed by channel number as a string:

"filters": { "6": { "despike": true, "remove_10hz": true, "remove_11_9hz": true,
                    "highpass_hz": 1.0, "lowpass_hz": 100.0 } }
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Every field is optional; a missing, false, null, zero or negative value turns that filter off, and a missing map means no filtering. The filters only change what is read (live plots and exports); the streamer and archiver ignore them and the archive keeps the raw readings. See docs/src/reference/kv-config.md and filters.ts.