Various code cleanup.

app/Models/PiggyBankEvent.php

@@ -24,6 +24,7 @@ namespace FireflyIII\Models;
 
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
  * Class PiggyBankEvent.
@@ -47,22 +48,16 @@ class PiggyBankEvent extends Model
             'updated_at' => 'datetime',
             'date'       => 'date',
         ];
-    /** @var array */
-    protected $dates = ['date'];
-    /**
-     * @var array
-     */
+    /** @var array Fields that can be filled */
     protected $fillable = ['piggy_bank_id', 'transaction_journal_id', 'date', 'amount'];
-    /**
-     * @var array
-     */
+    /** @var array Hidden from view */
     protected $hidden = ['amount_encrypted'];
 
     /**
      * @codeCoverageIgnore
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return BelongsTo
      */
-    public function piggyBank(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    public function piggyBank(): BelongsTo
     {
         return $this->belongsTo(PiggyBank::class);
     }
@@ -79,9 +74,9 @@ class PiggyBankEvent extends Model
 
     /**
      * @codeCoverageIgnore
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return BelongsTo
      */
-    public function transactionJournal(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    public function transactionJournal(): BelongsTo
     {
         return $this->belongsTo(TransactionJournal::class);
     }