Stage 11: account linking & merge (email + Telegram Login Widget) (#12)

backend/internal/postgres/migrations/00009_account_merge.sql

@@ -0,0 +1,24 @@
+-- +goose Up
+-- Stage 11 account linking & merge: retire a secondary account into a primary one.
+-- merged_into/merged_at turn the secondary into an audit tombstone (its identities
+-- are repointed and its non-shared rows transferred to the primary, but the row is
+-- kept so the no-cascade game_players/chat/complaints foreign keys of any shared
+-- finished game stay valid). merged_into self-references accounts and is SET NULL on
+-- delete so a future guest reaper (PLAN.md TODO-3) can still remove a primary.
+-- paid_account is a forward-looking lifetime one-time-payment marker (no purchase
+-- flow yet); the merge ORs it so a paid status is never lost. Adds columns, so the
+-- generated jet code is regenerated (cmd/jetgen).
+SET search_path = backend, pg_catalog;
+
+ALTER TABLE accounts
+    ADD COLUMN paid_account boolean     NOT NULL DEFAULT false,
+    ADD COLUMN merged_into  uuid        REFERENCES accounts (account_id) ON DELETE SET NULL,
+    ADD COLUMN merged_at    timestamptz;
+
+-- +goose Down
+SET search_path = backend, pg_catalog;
+
+ALTER TABLE accounts
+    DROP COLUMN merged_at,
+    DROP COLUMN merged_into,
+    DROP COLUMN paid_account;