[link] store share links

apps/link/migrations/0001_link.sql

@@ -0,0 +1,27 @@
+-- Share links (`POST /actionlink`): a short code standing for something in the game — a
+-- room, a club, an event — that a player can hand to someone else.
+--
+-- Each row is what the client sent, kept as sent:
+--   code_type      the link's kind, the `codeType` form field (3 club · 4 event · 5 room seen)
+--   extra_data_id  the id of the thing linked to, the `extraDataId` field (RoomId, ClubId,
+--                  PlayerEventId); NULL when the client sends none
+--   data           the `data` field verbatim: a JSON string `{ ExtraJson, Platform, Type }`
+--                  whose ExtraJson is itself an escaped JSON string. Stored opaque; nothing
+--                  here parses it
+--   valid_hours    the `validHours` field; `expires_at` is created_at plus that many hours
+--
+-- `code` is the six-character code answered to the client, unique across every link.
+-- A new code per request: asking twice for the same room gives two codes.
+
+CREATE TABLE IF NOT EXISTS link (
+  code TEXT PRIMARY KEY,
+  creator_account_id INTEGER NOT NULL,
+  code_type INTEGER NOT NULL,
+  extra_data_id INTEGER,
+  data TEXT,
+  valid_hours INTEGER NOT NULL,
+  created_at TEXT NOT NULL,
+  expires_at TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_link_target ON link (code_type, extra_data_id);