feat(mandate_kv): add kv support for mandate (#4275)

Co-authored-by: Akshay S <akshay.s@Akshay-Subramanian-D66TQ6D97K.local>
Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/storage_impl/src/lib.rs

@@ -12,6 +12,7 @@ pub mod customers;
 pub mod database;
 pub mod errors;
 mod lookup;
+pub mod mandate;
 pub mod metrics;
 pub mod mock_db;
 pub mod payment_method;
@@ -372,6 +373,15 @@ impl UniqueConstraints for diesel_models::PaymentMethod {
     }
 }
 
+impl UniqueConstraints for diesel_models::Mandate {
+    fn unique_constraints(&self) -> Vec<String> {
+        vec![format!("mand_{}_{}", self.merchant_id, self.mandate_id)]
+    }
+    fn table_name(&self) -> &str {
+        "Mandate"
+    }
+}
+
 impl UniqueConstraints for diesel_models::Customer {
     fn unique_constraints(&self) -> Vec<String> {
         vec![format!(

crates/storage_impl/src/mandate.rs

@@ -0,0 +1,5 @@
+use diesel_models::Mandate;
+
+use crate::redis::kv_store::KvStorePartition;
+
+impl KvStorePartition for Mandate {}

crates/storage_impl/src/redis/kv_store.rs

@@ -40,6 +40,10 @@ pub enum PartitionKey<'a> {
         merchant_id: &'a str,
         payout_attempt_id: &'a str,
     },
+    MerchantIdMandateId {
+        merchant_id: &'a str,
+        mandate_id: &'a str,
+    },
 }
 // PartitionKey::MerchantIdPaymentId {merchant_id, payment_id}
 impl<'a> std::fmt::Display for PartitionKey<'a> {
@@ -62,6 +66,10 @@ impl<'a> std::fmt::Display for PartitionKey<'a> {
                 merchant_id,
                 payout_attempt_id,
             } => f.write_str(&format!("mid_{merchant_id}_poa_{payout_attempt_id}")),
+            PartitionKey::MerchantIdMandateId {
+                merchant_id,
+                mandate_id,
+            } => f.write_str(&format!("mid_{merchant_id}_mandate_{mandate_id}")),
         }
     }
 }