Enforce unique recipe item positions per recipe (Maestro 75bb8cc1) (#198)

Co-authored-by: orchestrator-agent <20+orchestrator-agent@code.cubecraftcreations.com>

migrations/0018_recipe_item_position_unique.sql

@@ -0,0 +1,9 @@
+-- 0018_recipe_item_position_unique: position is the only record of recipe
+-- order, so a recipe never has two ingredients or two steps at one
+-- position. Writers replace a recipe's items whole, numbered from 0, and
+-- the detail read orders by position alone. A database already holding a
+-- duplicate fails this migration rather than keep an order nobody can
+-- trust.
+
+CREATE UNIQUE INDEX recipe_ingredients_recipe_position ON recipe_ingredients (recipe_id, position);
+CREATE UNIQUE INDEX recipe_steps_recipe_position ON recipe_steps (recipe_id, position);

migrations/queries/recipes.sql

@@ -48,7 +48,7 @@ INSERT INTO recipe_ingredients (
 -- name: ListRecipeIngredients :many
 SELECT * FROM recipe_ingredients
 WHERE recipe_id = ?
-ORDER BY position, id;
+ORDER BY position;
 
 -- name: DeleteRecipeIngredients :exec
 DELETE FROM recipe_ingredients
@@ -64,7 +64,7 @@ INSERT INTO recipe_steps (
 -- name: ListRecipeSteps :many
 SELECT * FROM recipe_steps
 WHERE recipe_id = ?
-ORDER BY position, id;
+ORDER BY position;
 
 -- name: DeleteRecipeSteps :exec
 DELETE FROM recipe_steps