V2: Episode logs table for LogProjector.

Note: content was originally declared :text, which becomes nvarchar(max) on Postgres but the legacy non-Unicode TEXT type on SQL Server. V19 converts it (and other affected columns) to nvarchar(max) on Tds so emoji and non-CP1252 characters round-trip. New migrations must not use bare :text — prefer {:string, size: :max} or adapter-branch.