diff --git a/database/migrations/2020_12_22_051133_create_recipe_steps_table.php b/database/migrations/2020_12_22_051133_create_recipe_steps_table.php
index 3a89613..acfcf8e 100644
--- a/database/migrations/2020_12_22_051133_create_recipe_steps_table.php
+++ b/database/migrations/2020_12_22_051133_create_recipe_steps_table.php
@@ -16,11 +16,10 @@ class CreateRecipeStepsTable extends Migration
     {
         Schema::create('recipe_steps', function (Blueprint $table) {
             $table->id();
-            $table->foreignIdFor(Recipe::class);
-            $table->unsignedInteger('number');
+            $table->foreignIdFor(Recipe::class)->index()->constrained()->cascadeOnUpdate()->cascadeOnDelete();
+            $table->unsignedInteger('number')->index();
             $table->longText('step');
             $table->timestamps();
-            $table->index('recipe_id', 'number');
         });
     }
 
diff --git a/database/migrations/2020_12_31_180016_create_journal_entries_table.php b/database/migrations/2020_12_31_180016_create_journal_entries_table.php
index d896c19..01836f4 100644
--- a/database/migrations/2020_12_31_180016_create_journal_entries_table.php
+++ b/database/migrations/2020_12_31_180016_create_journal_entries_table.php
@@ -16,8 +16,8 @@ class CreateJournalEntriesTable extends Migration
     {
         Schema::create('journal_entries', function (Blueprint $table) {
             $table->id();
-            $table->foreignIdFor(User::class);
-            $table->date('date')->useCurrent();
+            $table->foreignIdFor(User::class)->index()->constrained()->cascadeOnUpdate()->cascadeOnDelete();
+            $table->date('date')->index()->useCurrent();
             $table->string('summary');
             $table->unsignedFloat('calories')->default(0);
             $table->unsignedFloat('fat')->default(0);
@@ -27,7 +27,6 @@ class CreateJournalEntriesTable extends Migration
             $table->unsignedFloat('protein')->default(0);
             $table->enum('meal', ['breakfast', 'lunch', 'dinner', 'snacks']);
             $table->timestamps();
-            $table->index(['user_id', 'date']);
         });
     }
 
diff --git a/database/migrations/2021_01_01_170724_create_journalables_table.php b/database/migrations/2021_01_01_170724_create_journalables_table.php
index a3c0cf7..ea3be1b 100644
--- a/database/migrations/2021_01_01_170724_create_journalables_table.php
+++ b/database/migrations/2021_01_01_170724_create_journalables_table.php
@@ -15,7 +15,7 @@ class CreateJournalablesTable extends Migration
     public function up()
     {
         Schema::create('journalables', function (Blueprint $table) {
-            $table->foreignIdFor(JournalEntry::class)->index();
+            $table->foreignIdFor(JournalEntry::class)->index()->constrained()->cascadeOnUpdate()->cascadeOnDelete();
             $table->unsignedInteger('journalable_id');
             $table->string('journalable_type');
         });
diff --git a/database/migrations/2021_01_22_212856_create_ingredient_amounts_table.php b/database/migrations/2021_01_22_212856_create_ingredient_amounts_table.php
index c994f32..602ca54 100644
--- a/database/migrations/2021_01_22_212856_create_ingredient_amounts_table.php
+++ b/database/migrations/2021_01_22_212856_create_ingredient_amounts_table.php
@@ -21,7 +21,7 @@ class CreateIngredientAmountsTable extends Migration
             $table->enum('unit', ['tsp', 'tbsp', 'cup', 'oz', 'gram', 'serving'])->nullable();
             $table->string('detail')->nullable();
             $table->unsignedInteger('weight');
-            $table->unsignedInteger('parent_id');
+            $table->unsignedInteger('parent_id')->index();
             $table->string('parent_type');
             $table->timestamps();
         });
diff --git a/database/migrations/2021_02_19_080648_add_cascade_constraints.php b/database/migrations/2021_02_19_080648_add_cascade_constraints.php
new file mode 100644
index 0000000..a339f3d
--- /dev/null
+++ b/database/migrations/2021_02_19_080648_add_cascade_constraints.php
@@ -0,0 +1,88 @@
+<?php
+
+use App\Models\JournalEntry;
+use App\Models\Recipe;
+use App\Models\User;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddCascadeConstraints extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        // Recipe steps.
+        Schema::rename('recipe_steps', 'recipe_steps_old');
+        Schema::create('recipe_steps', function (Blueprint $table) {
+            $table->id();
+            $table->foreignIdFor(Recipe::class)->constrained()->cascadeOnUpdate()->cascadeOnDelete();
+            $table->unsignedInteger('number');
+            $table->longText('step');
+            $table->timestamps();
+        });
+        DB::insert("INSERT INTO `recipe_steps` SELECT * FROM `recipe_steps_old`;");
+        Schema::dropIfExists('recipe_steps_old');
+        Schema::table('recipe_steps', function (Blueprint $table) {
+            $table->index('recipe_id');
+            $table->index('number');
+        });
+
+        // Journal entries.
+        Schema::rename('journal_entries', 'journal_entries_old');
+        Schema::create('journal_entries', function (Blueprint $table) {
+            $table->id();
+            $table->foreignIdFor(User::class)->constrained()->cascadeOnUpdate()->cascadeOnDelete();
+            $table->date('date')->useCurrent();
+            $table->string('summary');
+            $table->unsignedFloat('calories')->default(0);
+            $table->unsignedFloat('fat')->default(0);
+            $table->unsignedFloat('cholesterol')->default(0);
+            $table->unsignedFloat('sodium')->default(0);
+            $table->unsignedFloat('carbohydrates')->default(0);
+            $table->unsignedFloat('protein')->default(0);
+            $table->enum('meal', ['breakfast', 'lunch', 'dinner', 'snacks']);
+            $table->timestamps();
+        });
+        DB::insert("INSERT INTO `journal_entries` SELECT * FROM `journal_entries_old`;");
+        Schema::dropIfExists('journal_entries_old');
+        Schema::table('journal_entries', function (Blueprint $table) {
+            $table->index('user_id');
+            $table->index('date');
+        });
+
+        // Journalables.
+        Schema::rename('journalables', 'journalables_old');
+        Schema::create('journalables', function (Blueprint $table) {
+            $table->foreignIdFor(JournalEntry::class)->constrained()->cascadeOnUpdate()->cascadeOnDelete();
+            $table->unsignedInteger('journalable_id');
+            $table->string('journalable_type');
+        });
+        DB::delete("DELETE FROM `journalables_old` WHERE `journal_entry_id` NOT IN (SELECT `id` FROM `journal_entries`);");
+        DB::insert("INSERT INTO `journalables` SELECT * FROM `journalables_old`;");
+        Schema::dropIfExists('journalables_old');
+        Schema::table('journalables', function (Blueprint $table) {
+            $table->index('journal_entry_id');
+        });
+
+        // Ingredient amounts (index only).
+        Schema::table('ingredient_amounts', function (Blueprint $table) {
+            $table->index('parent_id');
+        });
+
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}