diff --git a/backend/schema.sql b/backend/schema.sql
index 58139d4..a921b78 100644
--- a/backend/schema.sql
+++ b/backend/schema.sql
@@ -177,6 +177,7 @@ CREATE INDEX IF NOT EXISTS idx_activity_profile_date ON activity_log(profile_id,
 CREATE TABLE IF NOT EXISTS photos (
     id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
     profile_id  UUID NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,
+    meas_id     UUID,  -- Legacy: reference to measurement (circumference/caliper)
     date        DATE,
     path        TEXT NOT NULL,
     created     TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP