FEAT: Discovery Video Service Subscription

discovery/internal/db/migrations/0002_create_videos_table.up.sql

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+-- The catalogue's own copy of a video, built from the announcements cms
+-- publishes on the catalogue topic. It is a read model, not a second source of
+-- truth: every column here arrives in an announcement, and nothing in this
+-- service ever writes a video of its own.
+--
+-- id is the id cms issued, carried in the announcement and reused verbatim, so
+-- the two services can talk about the same video without a mapping table. It
+-- is therefore NOT generated here: no DEFAULT, unlike cms's videos.id.
+CREATE TABLE videos (
+    id UUID PRIMARY KEY,
+    title TEXT NOT NULL,
+    playback_url TEXT NOT NULL DEFAULT '',
+    -- Denormalized on purpose. cms owns the category vocabulary and sends
+    -- names, so there is nothing here to join to and no id to keep in step;
+    -- an array is what the read side actually serves.
+    categories TEXT[] NOT NULL DEFAULT '{}',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);