The device event history chart previously fetched all events and filtered
client-side. This wires the existing created_from API parameter to the
frontend so filtering happens in the backend.
Also fixes a bug where the Today filter returned no results: rusqlite was
storing datetimes with a space separator ("YYYY-MM-DD HH:MM:SS+00:00")
while SQL filters used RFC 3339 with a T separator, causing string
comparisons to fail for same-day events. All datetime storage across
device_events, devices, and notifications is now consistently RFC 3339.
A migration converts existing records.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Displays a scatter chart timeline of when the device was seen online,
with a time range selector (Today → Last Year). Tooltips show event
date/time, type, and highlight any IP or vendor changes relative to
the current device data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
