Rewrite identity and access management

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/migrations/20251205T150000Z.sql

@@ -0,0 +1,8 @@
+ALTER TABLE sessions ADD COLUMN tenant_id TEXT;
+ALTER TABLE sessions ADD COLUMN parent_session_id TEXT REFERENCES sessions(id);
+
+ALTER TABLE sessions ADD CONSTRAINT session_tenant_check CHECK (
+    (parent_session_id IS NULL AND tenant_id IS NULL) OR
+    (parent_session_id IS NOT NULL AND tenant_id IS NOT NULL)
+);
+