Added adoption report and transfer code

backend/src/db/schema.ts

@@ -292,8 +292,8 @@ export const ensureSchema = async (database: DatabaseClient = db) => {
 
     DROP INDEX IF EXISTS idx_birds_workspace_tag_id;
 
-    CREATE UNIQUE INDEX IF NOT EXISTS idx_birds_workspace_tag_id
-      ON birds (workspace_id, LOWER(tag_id))
+    CREATE UNIQUE INDEX IF NOT EXISTS idx_birds_global_tag_id
+      ON birds (LOWER(BTRIM(tag_id)))
       WHERE tag_id IS NOT NULL
         AND BTRIM(tag_id) <> ''
         AND LOWER(BTRIM(tag_id)) NOT IN ('unknown', 'not recorded', 'n/a', 'na', 'none');
@@ -346,6 +346,28 @@ export const ensureSchema = async (database: DatabaseClient = db) => {
 	      ON pending_bird_transfers (bird_id)
 	      WHERE completed_at IS NULL;
 
+    CREATE TABLE IF NOT EXISTS bird_transfer_codes (
+      id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+      code VARCHAR(32) NOT NULL UNIQUE,
+      bird_id UUID NOT NULL REFERENCES birds(id) ON DELETE CASCADE,
+      source_workspace_id INTEGER NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
+      requested_by_user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      completed_at TIMESTAMPTZ,
+      completed_workspace_id INTEGER REFERENCES workspaces(id) ON DELETE SET NULL,
+      revoked_at TIMESTAMPTZ,
+      created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_bird_transfer_codes_open_bird
+      ON bird_transfer_codes (bird_id, created_at DESC)
+      WHERE completed_at IS NULL
+        AND revoked_at IS NULL;
+
+    CREATE INDEX IF NOT EXISTS idx_bird_transfer_codes_code_open
+      ON bird_transfer_codes (code)
+      WHERE completed_at IS NULL
+        AND revoked_at IS NULL;
+
 	    CREATE TABLE IF NOT EXISTS flock_notes (
 	      id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
 	      workspace_id INTEGER NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,