split MintDatabase into separate narrower scoped traits

- MintKeysDatabase
- MintQuotesDatabase
- MintProofsDatabase
- MintSignaturesDatabase

This commit splits the MintDatabase trait with 30+ methods into a series
of smaller traits, each dedicate to a specific subsystem of the mint
service.

crates/cdk-common/src/database/mint/mod.rs

@@ -20,10 +20,10 @@ mod auth;
 #[cfg(feature = "auth")]
 pub use auth::MintAuthDatabase;
 
-/// Mint Database trait
+/// Mint Keys Database trait
 #[async_trait]
-pub trait Database {
-    /// Mint Database Error
+pub trait KeysDatabase {
+    /// Mint Keys Database Error
     type Err: Into<Error> + From<Error>;
 
     /// Add Active Keyset
@@ -32,6 +32,18 @@ pub trait Database {
     async fn get_active_keyset_id(&self, unit: &CurrencyUnit) -> Result<Option<Id>, Self::Err>;
     /// Get all Active Keyset
     async fn get_active_keysets(&self) -> Result<HashMap<CurrencyUnit, Id>, Self::Err>;
+    /// Add [`MintKeySetInfo`]
+    async fn add_keyset_info(&self, keyset: MintKeySetInfo) -> Result<(), Self::Err>;
+    /// Get [`MintKeySetInfo`]
+    async fn get_keyset_info(&self, id: &Id) -> Result<Option<MintKeySetInfo>, Self::Err>;
+    /// Get [`MintKeySetInfo`]s
+    async fn get_keyset_infos(&self) -> Result<Vec<MintKeySetInfo>, Self::Err>;
+}
+/// Mint Quote Database trait
+#[async_trait]
+pub trait QuotesDatabase {
+    /// Mint Quotes Database Error
+    type Err: Into<Error> + From<Error>;
 
     /// Add [`MintMintQuote`]
     async fn add_mint_quote(&self, quote: MintMintQuote) -> Result<(), Self::Err>;
@@ -89,13 +101,13 @@ pub trait Database {
         &self,
         quote_id: &Uuid,
     ) -> Result<Option<(MeltBolt11Request<Uuid>, PaymentProcessorKey)>, Self::Err>;
+}
 
-    /// Add [`MintKeySetInfo`]
-    async fn add_keyset_info(&self, keyset: MintKeySetInfo) -> Result<(), Self::Err>;
-    /// Get [`MintKeySetInfo`]
-    async fn get_keyset_info(&self, id: &Id) -> Result<Option<MintKeySetInfo>, Self::Err>;
-    /// Get [`MintKeySetInfo`]s
-    async fn get_keyset_infos(&self) -> Result<Vec<MintKeySetInfo>, Self::Err>;
+/// Mint Proof Database trait
+#[async_trait]
+pub trait ProofsDatabase {
+    /// Mint Proof Database Error
+    type Err: Into<Error> + From<Error>;
 
     /// Add  [`Proofs`]
     async fn add_proofs(&self, proof: Proofs, quote_id: Option<Uuid>) -> Result<(), Self::Err>;
@@ -122,6 +134,13 @@ pub trait Database {
         &self,
         keyset_id: &Id,
     ) -> Result<(Proofs, Vec<Option<State>>), Self::Err>;
+}
+
+#[async_trait]
+/// Mint Signatures Database trait
+pub trait SignaturesDatabase {
+    /// Mint Signature Database Error
+    type Err: Into<Error> + From<Error>;
 
     /// Add [`BlindSignature`]
     async fn add_blind_signatures(
@@ -145,14 +164,23 @@ pub trait Database {
         &self,
         quote_id: &Uuid,
     ) -> Result<Vec<BlindSignature>, Self::Err>;
+}
 
+/// Mint Database trait
+#[async_trait]
+pub trait Database<Error>:
+    KeysDatabase<Err = Error>
+    + QuotesDatabase<Err = Error>
+    + ProofsDatabase<Err = Error>
+    + SignaturesDatabase<Err = Error>
+{
     /// Set [`MintInfo`]
-    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), Self::Err>;
+    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), Error>;
     /// Get [`MintInfo`]
-    async fn get_mint_info(&self) -> Result<MintInfo, Self::Err>;
+    async fn get_mint_info(&self) -> Result<MintInfo, Error>;
 
     /// Set [`QuoteTTL`]
-    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), Self::Err>;
+    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), Error>;
     /// Get [`QuoteTTL`]
-    async fn get_quote_ttl(&self) -> Result<QuoteTTL, Self::Err>;
+    async fn get_quote_ttl(&self) -> Result<QuoteTTL, Error>;
 }

crates/cdk-common/src/database/mod.rs

@@ -5,10 +5,14 @@ mod mint;
 #[cfg(feature = "wallet")]
 mod wallet;
 
-#[cfg(feature = "mint")]
-pub use mint::Database as MintDatabase;
 #[cfg(all(feature = "mint", feature = "auth"))]
 pub use mint::MintAuthDatabase;
+#[cfg(feature = "mint")]
+pub use mint::{
+    Database as MintDatabase, KeysDatabase as MintKeysDatabase,
+    ProofsDatabase as MintProofsDatabase, QuotesDatabase as MintQuotesDatabase,
+    SignaturesDatabase as MintSignaturesDatabase,
+};
 #[cfg(feature = "wallet")]
 pub use wallet::Database as WalletDatabase;
 

crates/cdk-integration-tests/src/init_auth_mint.rs

@@ -19,7 +19,7 @@ pub async fn start_fake_mint_with_auth<D, A>(
     auth_database: A,
 ) -> Result<()>
 where
-    D: MintDatabase<Err = cdk_database::Error> + Send + Sync + 'static,
+    D: MintDatabase<cdk_database::Error> + Send + Sync + 'static,
     A: MintAuthDatabase<Err = cdk_database::Error> + Send + Sync + 'static,
 {
     let fee_reserve = FeeReserve {

crates/cdk-mintd/src/main.rs

@@ -121,7 +121,7 @@ async fn main() -> anyhow::Result<()> {
     // ENV VARS will take **priority** over those in the config
     let settings = settings.from_env()?;
 
-    let localstore: Arc<dyn MintDatabase<Err = cdk_database::Error> + Send + Sync> =
+    let localstore: Arc<dyn MintDatabase<cdk_database::Error> + Send + Sync> =
         match settings.database.engine {
             DatabaseEngine::Sqlite => {
                 let sql_db_path = work_dir.join("cdk-mintd.sqlite");

crates/cdk-redb/src/mint/mod.rs

@@ -8,7 +8,10 @@ use std::sync::Arc;
 
 use async_trait::async_trait;
 use cdk_common::common::{PaymentProcessorKey, QuoteTTL};
-use cdk_common::database::{self, MintDatabase};
+use cdk_common::database::{
+    self, MintDatabase, MintKeysDatabase, MintProofsDatabase, MintQuotesDatabase,
+    MintSignaturesDatabase,
+};
 use cdk_common::dhke::hash_to_curve;
 use cdk_common::mint::{self, MintKeySetInfo, MintQuote};
 use cdk_common::nut00::ProofsMethods;
@@ -165,7 +168,7 @@ impl MintRedbDatabase {
 }
 
 #[async_trait]
-impl MintDatabase for MintRedbDatabase {
+impl MintKeysDatabase for MintRedbDatabase {
     type Err = database::Error;
 
     async fn set_active_keyset(&self, unit: CurrencyUnit, id: Id) -> Result<(), Self::Err> {
@@ -261,6 +264,11 @@ impl MintDatabase for MintRedbDatabase {
 
         Ok(keysets)
     }
+}
+
+#[async_trait]
+impl MintQuotesDatabase for MintRedbDatabase {
+    type Err = database::Error;
 
     async fn add_mint_quote(&self, quote: MintQuote) -> Result<(), Self::Err> {
         let write_txn = self.db.begin_write().map_err(Error::from)?;
@@ -524,6 +532,52 @@ impl MintDatabase for MintRedbDatabase {
         Ok(())
     }
 
+    /// Add melt request
+    async fn add_melt_request(
+        &self,
+        melt_request: MeltBolt11Request<Uuid>,
+        ln_key: PaymentProcessorKey,
+    ) -> Result<(), Self::Err> {
+        let write_txn = self.db.begin_write().map_err(Error::from)?;
+        let mut table = write_txn.open_table(MELT_REQUESTS).map_err(Error::from)?;
+
+        table
+            .insert(
+                melt_request.quote.as_bytes(),
+                (
+                    serde_json::to_string(&melt_request)?.as_str(),
+                    serde_json::to_string(&ln_key)?.as_str(),
+                ),
+            )
+            .map_err(Error::from)?;
+
+        Ok(())
+    }
+    /// Get melt request
+    async fn get_melt_request(
+        &self,
+        quote_id: &Uuid,
+    ) -> Result<Option<(MeltBolt11Request<Uuid>, PaymentProcessorKey)>, Self::Err> {
+        let read_txn = self.db.begin_read().map_err(Error::from)?;
+        let table = read_txn.open_table(MELT_REQUESTS).map_err(Error::from)?;
+
+        match table.get(quote_id.as_bytes()).map_err(Error::from)? {
+            Some(melt_request) => {
+                let (melt_request_str, ln_key_str) = melt_request.value();
+                let melt_request = serde_json::from_str(melt_request_str)?;
+                let ln_key = serde_json::from_str(ln_key_str)?;
+
+                Ok(Some((melt_request, ln_key)))
+            }
+            None => Ok(None),
+        }
+    }
+}
+
+#[async_trait]
+impl MintProofsDatabase for MintRedbDatabase {
+    type Err = database::Error;
+
     async fn add_proofs(&self, proofs: Proofs, quote_id: Option<Uuid>) -> Result<(), Self::Err> {
         let write_txn = self.db.begin_write().map_err(Error::from)?;
 
@@ -745,6 +799,11 @@ impl MintDatabase for MintRedbDatabase {
 
         Ok(states)
     }
+}
+
+#[async_trait]
+impl MintSignaturesDatabase for MintRedbDatabase {
+    type Err = database::Error;
 
     async fn add_blind_signatures(
         &self,
@@ -827,47 +886,6 @@ impl MintDatabase for MintRedbDatabase {
             .collect())
     }
 
-    /// Add melt request
-    async fn add_melt_request(
-        &self,
-        melt_request: MeltBolt11Request<Uuid>,
-        ln_key: PaymentProcessorKey,
-    ) -> Result<(), Self::Err> {
-        let write_txn = self.db.begin_write().map_err(Error::from)?;
-        let mut table = write_txn.open_table(MELT_REQUESTS).map_err(Error::from)?;
-
-        table
-            .insert(
-                melt_request.quote.as_bytes(),
-                (
-                    serde_json::to_string(&melt_request)?.as_str(),
-                    serde_json::to_string(&ln_key)?.as_str(),
-                ),
-            )
-            .map_err(Error::from)?;
-
-        Ok(())
-    }
-    /// Get melt request
-    async fn get_melt_request(
-        &self,
-        quote_id: &Uuid,
-    ) -> Result<Option<(MeltBolt11Request<Uuid>, PaymentProcessorKey)>, Self::Err> {
-        let read_txn = self.db.begin_read().map_err(Error::from)?;
-        let table = read_txn.open_table(MELT_REQUESTS).map_err(Error::from)?;
-
-        match table.get(quote_id.as_bytes()).map_err(Error::from)? {
-            Some(melt_request) => {
-                let (melt_request_str, ln_key_str) = melt_request.value();
-                let melt_request = serde_json::from_str(melt_request_str)?;
-                let ln_key = serde_json::from_str(ln_key_str)?;
-
-                Ok(Some((melt_request, ln_key)))
-            }
-            None => Ok(None),
-        }
-    }
-
     /// Get [`BlindSignature`]s for quote
     async fn get_blind_signatures_for_quote(
         &self,
@@ -897,8 +915,11 @@ impl MintDatabase for MintRedbDatabase {
 
         Ok(signatures)
     }
+}
 
-    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), Self::Err> {
+#[async_trait]
+impl MintDatabase<database::Error> for MintRedbDatabase {
+    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), database::Error> {
         let write_txn = self.db.begin_write().map_err(Error::from)?;
 
         {
@@ -911,7 +932,7 @@ impl MintDatabase for MintRedbDatabase {
 
         Ok(())
     }
-    async fn get_mint_info(&self) -> Result<MintInfo, Self::Err> {
+    async fn get_mint_info(&self) -> Result<MintInfo, database::Error> {
         let read_txn = self.db.begin_read().map_err(Error::from)?;
         let table = read_txn.open_table(CONFIG_TABLE).map_err(Error::from)?;
 
@@ -924,7 +945,7 @@ impl MintDatabase for MintRedbDatabase {
         Err(Error::UnknownMintInfo.into())
     }
 
-    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), Self::Err> {
+    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), database::Error> {
         let write_txn = self.db.begin_write().map_err(Error::from)?;
 
         {
@@ -937,7 +958,7 @@ impl MintDatabase for MintRedbDatabase {
 
         Ok(())
     }
-    async fn get_quote_ttl(&self) -> Result<QuoteTTL, Self::Err> {
+    async fn get_quote_ttl(&self) -> Result<QuoteTTL, database::Error> {
         let read_txn = self.db.begin_read().map_err(Error::from)?;
         let table = read_txn.open_table(CONFIG_TABLE).map_err(Error::from)?;
 

crates/cdk-sqlite/src/mint/memory.rs

@@ -2,7 +2,9 @@
 use std::collections::HashMap;
 
 use cdk_common::common::PaymentProcessorKey;
-use cdk_common::database::{self, MintDatabase};
+use cdk_common::database::{
+    self, MintDatabase, MintKeysDatabase, MintProofsDatabase, MintQuotesDatabase,
+};
 use cdk_common::mint::{self, MintKeySetInfo, MintQuote};
 use cdk_common::nuts::{CurrencyUnit, Id, MeltBolt11Request, Proofs};
 use cdk_common::MintInfo;

crates/cdk-sqlite/src/mint/mod.rs

@@ -7,7 +7,10 @@ use std::str::FromStr;
 use async_trait::async_trait;
 use bitcoin::bip32::DerivationPath;
 use cdk_common::common::{PaymentProcessorKey, QuoteTTL};
-use cdk_common::database::{self, MintDatabase};
+use cdk_common::database::{
+    self, MintDatabase, MintKeysDatabase, MintProofsDatabase, MintQuotesDatabase,
+    MintSignaturesDatabase,
+};
 use cdk_common::mint::{self, MintKeySetInfo, MintQuote};
 use cdk_common::nut00::ProofsMethods;
 use cdk_common::nut05::QuoteState;
@@ -105,7 +108,7 @@ impl MintSqliteDatabase {
 }
 
 #[async_trait]
-impl MintDatabase for MintSqliteDatabase {
+impl MintKeysDatabase for MintSqliteDatabase {
     type Err = database::Error;
 
     async fn set_active_keyset(&self, unit: CurrencyUnit, id: Id) -> Result<(), Self::Err> {
@@ -244,6 +247,121 @@ WHERE active = 1
         }
     }
 
+    async fn add_keyset_info(&self, keyset: MintKeySetInfo) -> Result<(), Self::Err> {
+        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
+        let res = sqlx::query(
+            r#"
+INSERT INTO keyset
+(id, unit, active, valid_from, valid_to, derivation_path, max_order, input_fee_ppk, derivation_path_index)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    unit = excluded.unit,
+    active = excluded.active,
+    valid_from = excluded.valid_from,
+    valid_to = excluded.valid_to,
+    derivation_path = excluded.derivation_path,
+    max_order = excluded.max_order,
+    input_fee_ppk = excluded.input_fee_ppk,
+    derivation_path_index = excluded.derivation_path_index
+        "#,
+        )
+        .bind(keyset.id.to_string())
+        .bind(keyset.unit.to_string())
+        .bind(keyset.active)
+        .bind(keyset.valid_from as i64)
+        .bind(keyset.valid_to.map(|v| v as i64))
+        .bind(keyset.derivation_path.to_string())
+        .bind(keyset.max_order)
+        .bind(keyset.input_fee_ppk as i64)
+            .bind(keyset.derivation_path_index)
+        .execute(&mut *transaction)
+        .await;
+
+        match res {
+            Ok(_) => {
+                transaction.commit().await.map_err(Error::from)?;
+                Ok(())
+            }
+            Err(err) => {
+                tracing::error!("SQLite could not add keyset info");
+                if let Err(err) = transaction.rollback().await {
+                    tracing::error!("Could not rollback sql transaction: {}", err);
+                }
+
+                Err(Error::from(err).into())
+            }
+        }
+    }
+
+    async fn get_keyset_info(&self, id: &Id) -> Result<Option<MintKeySetInfo>, Self::Err> {
+        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
+        let rec = sqlx::query(
+            r#"
+SELECT *
+FROM keyset
+WHERE id=?;
+        "#,
+        )
+        .bind(id.to_string())
+        .fetch_one(&mut *transaction)
+        .await;
+
+        match rec {
+            Ok(rec) => {
+                transaction.commit().await.map_err(Error::from)?;
+                Ok(Some(sqlite_row_to_keyset_info(rec)?))
+            }
+            Err(err) => match err {
+                sqlx::Error::RowNotFound => {
+                    transaction.commit().await.map_err(Error::from)?;
+                    return Ok(None);
+                }
+                _ => {
+                    tracing::error!("SQLite could not get keyset info");
+                    if let Err(err) = transaction.rollback().await {
+                        tracing::error!("Could not rollback sql transaction: {}", err);
+                    }
+                    return Err(Error::SQLX(err).into());
+                }
+            },
+        }
+    }
+
+    async fn get_keyset_infos(&self) -> Result<Vec<MintKeySetInfo>, Self::Err> {
+        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
+        let recs = sqlx::query(
+            r#"
+SELECT *
+FROM keyset;
+        "#,
+        )
+        .fetch_all(&mut *transaction)
+        .await
+        .map_err(Error::from);
+
+        match recs {
+            Ok(recs) => {
+                transaction.commit().await.map_err(Error::from)?;
+                Ok(recs
+                    .into_iter()
+                    .map(sqlite_row_to_keyset_info)
+                    .collect::<Result<_, _>>()?)
+            }
+            Err(err) => {
+                tracing::error!("SQLite could not get keyset info");
+                if let Err(err) = transaction.rollback().await {
+                    tracing::error!("Could not rollback sql transaction: {}", err);
+                }
+                Err(err.into())
+            }
+        }
+    }
+}
+
+#[async_trait]
+impl MintQuotesDatabase for MintSqliteDatabase {
+    type Err = database::Error;
+
     async fn add_mint_quote(&self, quote: MintQuote) -> Result<(), Self::Err> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
 
@@ -763,33 +881,30 @@ WHERE id=?
         }
     }
 
-    async fn add_keyset_info(&self, keyset: MintKeySetInfo) -> Result<(), Self::Err> {
+    async fn add_melt_request(
+        &self,
+        melt_request: MeltBolt11Request<Uuid>,
+        ln_key: PaymentProcessorKey,
+    ) -> Result<(), Self::Err> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
+
         let res = sqlx::query(
             r#"
-INSERT INTO keyset
-(id, unit, active, valid_from, valid_to, derivation_path, max_order, input_fee_ppk, derivation_path_index)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+INSERT INTO melt_request
+(id, inputs, outputs, method, unit)
+VALUES (?, ?, ?, ?, ?)
 ON CONFLICT(id) DO UPDATE SET
-    unit = excluded.unit,
-    active = excluded.active,
-    valid_from = excluded.valid_from,
-    valid_to = excluded.valid_to,
-    derivation_path = excluded.derivation_path,
-    max_order = excluded.max_order,
-    input_fee_ppk = excluded.input_fee_ppk,
-    derivation_path_index = excluded.derivation_path_index
+    inputs = excluded.inputs,
+    outputs = excluded.outputs,
+    method = excluded.method,
+    unit = excluded.unit
         "#,
         )
-        .bind(keyset.id.to_string())
-        .bind(keyset.unit.to_string())
-        .bind(keyset.active)
-        .bind(keyset.valid_from as i64)
-        .bind(keyset.valid_to.map(|v| v as i64))
-        .bind(keyset.derivation_path.to_string())
-        .bind(keyset.max_order)
-        .bind(keyset.input_fee_ppk as i64)
-            .bind(keyset.derivation_path_index)
+        .bind(melt_request.quote)
+        .bind(serde_json::to_string(&melt_request.inputs)?)
+        .bind(serde_json::to_string(&melt_request.outputs)?)
+        .bind(ln_key.method.to_string())
+        .bind(ln_key.unit.to_string())
         .execute(&mut *transaction)
         .await;
 
@@ -799,7 +914,7 @@ ON CONFLICT(id) DO UPDATE SET
                 Ok(())
             }
             Err(err) => {
-                tracing::error!("SQLite could not add keyset info");
+                tracing::error!("SQLite Could not update keyset");
                 if let Err(err) = transaction.rollback().await {
                     tracing::error!("Could not rollback sql transaction: {}", err);
                 }
@@ -809,23 +924,30 @@ ON CONFLICT(id) DO UPDATE SET
         }
     }
 
-    async fn get_keyset_info(&self, id: &Id) -> Result<Option<MintKeySetInfo>, Self::Err> {
+    async fn get_melt_request(
+        &self,
+        quote_id: &Uuid,
+    ) -> Result<Option<(MeltBolt11Request<Uuid>, PaymentProcessorKey)>, Self::Err> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
+
         let rec = sqlx::query(
             r#"
 SELECT *
-FROM keyset
+FROM melt_request
 WHERE id=?;
         "#,
         )
-        .bind(id.to_string())
+        .bind(quote_id.as_hyphenated())
         .fetch_one(&mut *transaction)
         .await;
 
         match rec {
             Ok(rec) => {
                 transaction.commit().await.map_err(Error::from)?;
-                Ok(Some(sqlite_row_to_keyset_info(rec)?))
+
+                let (request, key) = sqlite_row_to_melt_request(rec)?;
+
+                Ok(Some((request, key)))
             }
             Err(err) => match err {
                 sqlx::Error::RowNotFound => {
@@ -833,45 +955,21 @@ WHERE id=?;
                     return Ok(None);
                 }
                 _ => {
-                    tracing::error!("SQLite could not get keyset info");
+                    return {
                         if let Err(err) = transaction.rollback().await {
                             tracing::error!("Could not rollback sql transaction: {}", err);
                         }
-                    return Err(Error::SQLX(err).into());
+                        Err(Error::SQLX(err).into())
+                    }
                 }
             },
         }
     }
+}
 
-    async fn get_keyset_infos(&self) -> Result<Vec<MintKeySetInfo>, Self::Err> {
-        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
-        let recs = sqlx::query(
-            r#"
-SELECT *
-FROM keyset;
-        "#,
-        )
-        .fetch_all(&mut *transaction)
-        .await
-        .map_err(Error::from);
-
-        match recs {
-            Ok(recs) => {
-                transaction.commit().await.map_err(Error::from)?;
-                Ok(recs
-                    .into_iter()
-                    .map(sqlite_row_to_keyset_info)
-                    .collect::<Result<_, _>>()?)
-            }
-            Err(err) => {
-                tracing::error!("SQLite could not get keyset info");
-                if let Err(err) = transaction.rollback().await {
-                    tracing::error!("Could not rollback sql transaction: {}", err);
-                }
-                Err(err.into())
-            }
-        }
-    }
+#[async_trait]
+impl MintProofsDatabase for MintSqliteDatabase {
+    type Err = database::Error;
 
     async fn add_proofs(&self, proofs: Proofs, quote_id: Option<Uuid>) -> Result<(), Self::Err> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
@@ -1176,6 +1274,11 @@ WHERE keyset_id=?;
 
         Ok(ys.iter().map(|y| current_states.remove(y)).collect())
     }
+}
+
+#[async_trait]
+impl MintSignaturesDatabase for MintSqliteDatabase {
+    type Err = database::Error;
 
     async fn add_blind_signatures(
         &self,
@@ -1290,91 +1393,6 @@ WHERE keyset_id=?;
         }
     }
 
-    async fn add_melt_request(
-        &self,
-        melt_request: MeltBolt11Request<Uuid>,
-        ln_key: PaymentProcessorKey,
-    ) -> Result<(), Self::Err> {
-        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
-
-        let res = sqlx::query(
-            r#"
-INSERT INTO melt_request
-(id, inputs, outputs, method, unit)
-VALUES (?, ?, ?, ?, ?)
-ON CONFLICT(id) DO UPDATE SET
-    inputs = excluded.inputs,
-    outputs = excluded.outputs,
-    method = excluded.method,
-    unit = excluded.unit
-        "#,
-        )
-        .bind(melt_request.quote)
-        .bind(serde_json::to_string(&melt_request.inputs)?)
-        .bind(serde_json::to_string(&melt_request.outputs)?)
-        .bind(ln_key.method.to_string())
-        .bind(ln_key.unit.to_string())
-        .execute(&mut *transaction)
-        .await;
-
-        match res {
-            Ok(_) => {
-                transaction.commit().await.map_err(Error::from)?;
-                Ok(())
-            }
-            Err(err) => {
-                tracing::error!("SQLite Could not update keyset");
-                if let Err(err) = transaction.rollback().await {
-                    tracing::error!("Could not rollback sql transaction: {}", err);
-                }
-
-                Err(Error::from(err).into())
-            }
-        }
-    }
-
-    async fn get_melt_request(
-        &self,
-        quote_id: &Uuid,
-    ) -> Result<Option<(MeltBolt11Request<Uuid>, PaymentProcessorKey)>, Self::Err> {
-        let mut transaction = self.pool.begin().await.map_err(Error::from)?;
-
-        let rec = sqlx::query(
-            r#"
-SELECT *
-FROM melt_request
-WHERE id=?;
-        "#,
-        )
-        .bind(quote_id.as_hyphenated())
-        .fetch_one(&mut *transaction)
-        .await;
-
-        match rec {
-            Ok(rec) => {
-                transaction.commit().await.map_err(Error::from)?;
-
-                let (request, key) = sqlite_row_to_melt_request(rec)?;
-
-                Ok(Some((request, key)))
-            }
-            Err(err) => match err {
-                sqlx::Error::RowNotFound => {
-                    transaction.commit().await.map_err(Error::from)?;
-                    return Ok(None);
-                }
-                _ => {
-                    return {
-                        if let Err(err) = transaction.rollback().await {
-                            tracing::error!("Could not rollback sql transaction: {}", err);
-                        }
-                        Err(Error::SQLX(err).into())
-                    }
-                }
-            },
-        }
-    }
-
     /// Get [`BlindSignature`]s for quote
     async fn get_blind_signatures_for_quote(
         &self,
@@ -1412,8 +1430,11 @@ WHERE quote_id=?;
             }
         }
     }
+}
 
-    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), Self::Err> {
+#[async_trait]
+impl MintDatabase<database::Error> for MintSqliteDatabase {
+    async fn set_mint_info(&self, mint_info: MintInfo) -> Result<(), database::Error> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
 
         let res = sqlx::query(
@@ -1446,7 +1467,7 @@ ON CONFLICT(id) DO UPDATE SET
             }
         }
     }
-    async fn get_mint_info(&self) -> Result<MintInfo, Self::Err> {
+    async fn get_mint_info(&self) -> Result<MintInfo, database::Error> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
 
         let rec = sqlx::query(
@@ -1487,7 +1508,7 @@ WHERE id=?;
         }
     }
 
-    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), Self::Err> {
+    async fn set_quote_ttl(&self, quote_ttl: QuoteTTL) -> Result<(), database::Error> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
 
         let res = sqlx::query(
@@ -1520,7 +1541,7 @@ ON CONFLICT(id) DO UPDATE SET
             }
         }
     }
-    async fn get_quote_ttl(&self) -> Result<QuoteTTL, Self::Err> {
+    async fn get_quote_ttl(&self) -> Result<QuoteTTL, database::Error> {
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
 
         let rec = sqlx::query(

crates/cdk/src/mint/builder.rs

@@ -32,7 +32,7 @@ pub struct MintBuilder {
     /// Mint Info
     pub mint_info: MintInfo,
     /// Mint Storage backend
-    localstore: Option<Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>>,
+    localstore: Option<Arc<dyn MintDatabase<database::Error> + Send + Sync>>,
     /// Mint Storage backend
     #[cfg(feature = "auth")]
     auth_localstore: Option<Arc<dyn MintAuthDatabase<Err = cdk_database::Error> + Send + Sync>>,
@@ -70,7 +70,7 @@ impl MintBuilder {
     /// Set localstore
     pub fn with_localstore(
         mut self,
-        localstore: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+        localstore: Arc<dyn MintDatabase<database::Error> + Send + Sync>,
     ) -> MintBuilder {
         self.localstore = Some(localstore);
         self

crates/cdk/src/mint/keysets/mod.rs

@@ -23,7 +23,7 @@ impl Mint {
     pub async fn init_keysets(
         xpriv: Xpriv,
         secp_ctx: &Secp256k1<All>,
-        localstore: &Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+        localstore: &Arc<dyn MintDatabase<database::Error> + Send + Sync>,
         supported_units: &HashMap<CurrencyUnit, (u64, u8)>,
         custom_paths: &HashMap<CurrencyUnit, DerivationPath>,
     ) -> Result<(HashMap<Id, MintKeySet>, Vec<CurrencyUnit>), Error> {

crates/cdk/src/mint/mod.rs

@@ -49,7 +49,7 @@ pub use verification::Verification;
 #[derive(Clone)]
 pub struct Mint {
     /// Mint Storage backend
-    pub localstore: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+    pub localstore: Arc<dyn MintDatabase<database::Error> + Send + Sync>,
     /// Auth Storage backend (only available with auth feature)
     #[cfg(feature = "auth")]
     pub auth_localstore: Option<Arc<dyn MintAuthDatabase<Err = database::Error> + Send + Sync>>,
@@ -70,7 +70,7 @@ impl Mint {
     /// Create new [`Mint`] without authentication
     pub async fn new(
         seed: &[u8],
-        localstore: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+        localstore: Arc<dyn MintDatabase<database::Error> + Send + Sync>,
         ln: HashMap<
             PaymentProcessorKey,
             Arc<dyn MintPayment<Err = cdk_payment::Error> + Send + Sync>,
@@ -96,7 +96,7 @@ impl Mint {
     #[cfg(feature = "auth")]
     pub async fn new_with_auth(
         seed: &[u8],
-        localstore: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+        localstore: Arc<dyn MintDatabase<database::Error> + Send + Sync>,
         auth_localstore: Arc<dyn MintAuthDatabase<Err = database::Error> + Send + Sync>,
         ln: HashMap<
             PaymentProcessorKey,
@@ -121,7 +121,7 @@ impl Mint {
     /// Internal function to create a new [`Mint`] with shared logic
     async fn new_internal(
         seed: &[u8],
-        localstore: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>,
+        localstore: Arc<dyn MintDatabase<database::Error> + Send + Sync>,
         #[cfg(feature = "auth")] auth_localstore: Option<
             Arc<dyn database::MintAuthDatabase<Err = database::Error> + Send + Sync>,
         >,

crates/cdk/src/mint/subscription/manager.rs

@@ -28,8 +28,8 @@ impl Default for PubSubManager {
     }
 }
 
-impl From<Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>> for PubSubManager {
-    fn from(val: Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>) -> Self {
+impl From<Arc<dyn MintDatabase<database::Error> + Send + Sync>> for PubSubManager {
+    fn from(val: Arc<dyn MintDatabase<database::Error> + Send + Sync>) -> Self {
         PubSubManager(OnSubscription(Some(val)).into())
     }
 }

crates/cdk/src/mint/subscription/on_subscription.rs

@@ -17,9 +17,7 @@ use crate::nuts::{MeltQuoteBolt11Response, MintQuoteBolt11Response, ProofState,
 /// This struct triggers code when a new subscription is created.
 ///
 /// It is used to send the initial state of the subscription to the client.
-pub struct OnSubscription(
-    pub(crate) Option<Arc<dyn MintDatabase<Err = database::Error> + Send + Sync>>,
-);
+pub struct OnSubscription(pub(crate) Option<Arc<dyn MintDatabase<database::Error> + Send + Sync>>);
 
 #[async_trait::async_trait]
 impl OnNewSubscription for OnSubscription {