diff --git a/services/core/migrations/000012_turn_settings.sql b/services/core/migrations/000012_turn_settings.sql
index 9818714a2..5565c5fee 100644
--- a/services/core/migrations/000012_turn_settings.sql
+++ b/services/core/migrations/000012_turn_settings.sql
@@ -1,3 +1,16 @@
 -- +goose Up
-ALTER TABLE turns ADD COLUMN settings jsonb NOT NULL CHECK (jsonb_typeof(settings) = 'object');
-ALTER TABLE environment_input_reservations ADD COLUMN settings jsonb NOT NULL CHECK (jsonb_typeof(settings) = 'object');
+-- Existing Turns and reservations bind their Session's current settings, as sessions.TurnSettingsOf projects them.
+CREATE TEMPORARY TABLE bound_settings AS
+SELECT id AS session_id, jsonb_build_object(
+    'model', coalesce(configuration #>> '{agent,model}', ''),
+    'reasoning_effort', configuration #> '{agent,reasoning,effort}',
+    'service_tier', coalesce(configuration #>> '{agent,service_tier}', ''),
+    'review', coalesce(configuration ->> 'review', 'none')) AS settings
+FROM sessions;
+ALTER TABLE turns ADD COLUMN settings jsonb;
+UPDATE turns SET settings = b.settings FROM bound_settings b WHERE b.session_id = turns.session_id;
+ALTER TABLE turns ALTER COLUMN settings SET NOT NULL, ADD CONSTRAINT turns_settings_check CHECK (jsonb_typeof(settings) = 'object');
+ALTER TABLE environment_input_reservations ADD COLUMN settings jsonb;
+UPDATE environment_input_reservations SET settings = b.settings FROM bound_settings b WHERE b.session_id = environment_input_reservations.session_id;
+ALTER TABLE environment_input_reservations ALTER COLUMN settings SET NOT NULL, ADD CONSTRAINT environment_input_reservations_settings_check CHECK (jsonb_typeof(settings) = 'object');
+DROP TABLE bound_settings;