diff --git a/src/app/models/db/DBChain.ts b/src/app/models/db/DBChain.ts
new file mode 100644
index 0000000..4d5804f
--- /dev/null
+++ b/src/app/models/db/DBChain.ts
@@ -0,0 +1,3 @@
+import { Chain } from '../Chain';
+
+export class DBChain extends Chain {}
diff --git a/src/app/models/db/DBEstablishment.ts b/src/app/models/db/DBEstablishment.ts
new file mode 100644
index 0000000..e707cc1
--- /dev/null
+++ b/src/app/models/db/DBEstablishment.ts
@@ -0,0 +1,3 @@
+export class DBEstablishment {
+  constructor(public address: string, public chain_id: number, public id?: number) {}
+}
diff --git a/src/app/models/db/DBProduct.ts b/src/app/models/db/DBProduct.ts
new file mode 100644
index 0000000..89a3d81
--- /dev/null
+++ b/src/app/models/db/DBProduct.ts
@@ -0,0 +1,3 @@
+import { Product } from '../Product';
+
+export class DBProduct extends Product {}
diff --git a/src/app/models/db/DBProductEstablishment.ts b/src/app/models/db/DBProductEstablishment.ts
new file mode 100644
index 0000000..d5bf506
--- /dev/null
+++ b/src/app/models/db/DBProductEstablishment.ts
@@ -0,0 +1,3 @@
+export class DBProductEstablishment {
+  constructor(public product_id: number, public establishment_id: number, public id?: number) {}
+}
diff --git a/src/app/models/db/DBPurchase.ts b/src/app/models/db/DBPurchase.ts
new file mode 100644
index 0000000..ecc97d9
--- /dev/null
+++ b/src/app/models/db/DBPurchase.ts
@@ -0,0 +1,10 @@
+export class DBPurchase {
+  constructor(
+    public establishment_id: number,
+    public product_id: number,
+    public date: number,
+    public price = 0,
+    public quantity = 1,
+    public id?: number
+  ) {}
+}