Successfully completed database change OMG; this will save memory by storing less duplicate data

app/src/main/java/com/denizk0461/studip/model/CanteenOffer.kt

@@ -1,16 +1,15 @@
 package com.denizk0461.studip.model
 
-import androidx.room.Entity
-import androidx.room.PrimaryKey
-
 //@Entity(tableName = "offers")
 data class CanteenOffer(
 //    @PrimaryKey val id: Int,
     val id: Int,
     val date: String,
-    val dateId: Int, // gives every item on the same day the same ID for easier filtering
-//    val canteen: Int,
+    val dateId: Int,
     val category: String,
+    val categoryId: Int,
+    val canteen: String,
+    val canteenId: Int,
     val title: String,
     val price: String, // price for students
     val isFair: Boolean, // artgerechte Tierhaltung

app/src/main/java/com/denizk0461/studip/model/OfferCategory.kt

@@ -1,6 +1,5 @@
 package com.denizk0461.studip.model
 
-import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.ForeignKey
 import androidx.room.PrimaryKey
@@ -11,20 +10,20 @@ import androidx.room.PrimaryKey
         ForeignKey(
             OfferDate::class,
             ["id"],
-            ["date_id"],
+            ["dateId"],
             ForeignKey.CASCADE,
         ),
         ForeignKey(
             OfferCanteen::class,
             ["id"],
-            ["canteen_id"],
+            ["canteenId"],
             ForeignKey.CASCADE,
         ),
     ]
 )
 data class OfferCategory(
     @PrimaryKey val id: Int,
-    @ColumnInfo(name = "date_id") val dateId: Int,
-    @ColumnInfo(name = "canteen_id") val canteenId: Int,
+    val dateId: Int,
+    val canteenId: Int,
     val category: String,
 )

app/src/main/java/com/denizk0461/studip/model/OfferItem.kt

@@ -1,6 +1,5 @@
 package com.denizk0461.studip.model
 
-import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.ForeignKey
 import androidx.room.PrimaryKey
@@ -11,15 +10,15 @@ import androidx.room.PrimaryKey
         ForeignKey(
             OfferCategory::class,
             ["id"],
-            ["category_id"],
+            ["categoryId"],
             ForeignKey.CASCADE,
         ),
     ]
 )
 data class OfferItem(
     @PrimaryKey val id: Int,
-    @ColumnInfo(name = "category_id") val categoryId: Int,
-    val title: Int,
+    val categoryId: Int,
+    val title: String,
     val price: String,
     val isFair: Boolean,
     val isFish: Boolean,