Timeline Custom Rendering
A MultiTableTemplate draws one table's rows on a Timeline the page's own way — in React, an entry of templates. The row's whole record is at hand, with every column its view reads, so a template can show what the timeline's own drawing leaves out. The tables without one keep the timeline's drawing.
Schmeler and Sons' activities
Tasks, phone calls and appointments, each drawn by a template of its own, beside the account's notes and messages, which the timeline draws as it always does. The view names the columns the templates show — a task's priority, a call's direction and number, an appointment's place — so the timeline reads them with each row.