Do not use `INSERT OR REPLACE` in SQLite. (#620)

Instead, use `INSERT` and `ON CONFLICT`.  The reason is that in case of
conflicts, the `REPLACE` will trigger a DELETE and then perform an INSERT, as
outlined in the documentation[1], and that may cause a cascade of deletion due
to our FOREIGN KEYs.

Here is the official documentation:

```
When a UNIQUE or PRIMARY KEY constraint violation occurs, the REPLACE algorithm
deletes pre-existing rows that are causing the constraint violation prior to
inserting or updating the current row and the command continues executing
normally. If a NOT NULL constraint violation occurs, the REPLACE conflict
resolution replaces the NULL value with the default value for that column, or
if the column has no default value, then the ABORT algorithm is used. If
a CHECK constraint or foreign key constraint violation occurs, the REPLACE
conflict resolution algorithm works like ABORT.  When the REPLACE conflict
resolution strategy deletes rows in order to satisfy a constraint, delete
triggers fire if and only if recursive triggers are enabled.  The update
hook is not invoked for rows that are deleted by the REPLACE conflict
resolution strategy. Nor does REPLACE increment the change counter. The
exceptional behaviors defined in this paragraph might change in a future
release.
```

[1] https://www.sqlite.org/lang_conflict.html

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

@@ -205,9 +205,23 @@ WHERE active = 1
 
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO mint_quote
+INSERT INTO mint_quote
 (id, amount, unit, request, state, expiry, request_lookup_id, pubkey)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    amount = excluded.amount,
+    unit = excluded.unit,
+    request = excluded.request,
+    state = excluded.state,
+    expiry = excluded.expiry,
+    request_lookup_id = excluded.request_lookup_id
+ON CONFLICT(request_lookup_id) DO UPDATE SET
+    amount = excluded.amount,
+    unit = excluded.unit,
+    request = excluded.request,
+    state = excluded.state,
+    expiry = excluded.expiry,
+    id = excluded.id
         "#,
         )
         .bind(quote.id.to_string())
@@ -438,8 +452,8 @@ FROM mint_quote
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
         let rec = sqlx::query(
             r#"
-SELECT * 
-FROM mint_quote 
+SELECT *
+FROM mint_quote
 WHERE state = ?
         "#,
         )
@@ -502,9 +516,28 @@ WHERE id=?
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO melt_quote
+INSERT INTO melt_quote
 (id, unit, amount, request, fee_reserve, state, expiry, payment_preimage, request_lookup_id, msat_to_pay)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    unit = excluded.unit,
+    amount = excluded.amount,
+    request = excluded.request,
+    fee_reserve = excluded.fee_reserve,
+    state = excluded.state,
+    expiry = excluded.expiry,
+    payment_preimage = excluded.payment_preimage,
+    request_lookup_id = excluded.request_lookup_id,
+    msat_to_pay = excluded.msat_to_pay
+ON CONFLICT(request_lookup_id) DO UPDATE SET
+    unit = excluded.unit,
+    amount = excluded.amount,
+    request = excluded.request,
+    fee_reserve = excluded.fee_reserve,
+    state = excluded.state,
+    expiry = excluded.expiry,
+    payment_preimage = excluded.payment_preimage,
+    id = excluded.id;
         "#,
         )
         .bind(quote.id.to_string())
@@ -690,9 +723,18 @@ WHERE id=?
         let mut transaction = self.pool.begin().await.map_err(Error::from)?;
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO keyset
+INSERT INTO keyset
 (id, unit, active, valid_from, valid_to, derivation_path, max_order, input_fee_ppk, derivation_path_index)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?);
+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())
@@ -1176,9 +1218,14 @@ WHERE keyset_id=?;
 
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO melt_request
+INSERT INTO melt_request
 (id, inputs, outputs, method, unit)
-VALUES (?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    inputs = excluded.inputs,
+    outputs = excluded.outputs,
+    method = excluded.method,
+    unit = excluded.unit
         "#,
         )
         .bind(melt_request.quote)
@@ -1290,9 +1337,12 @@ WHERE quote_id=?;
 
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO config
+INSERT INTO config
 (id, value)
-VALUES (?, ?);
+VALUES (?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    value = excluded.value
+;
         "#,
         )
         .bind("mint_info")
@@ -1361,9 +1411,12 @@ WHERE id=?;
 
         let res = sqlx::query(
             r#"
-INSERT OR REPLACE INTO config
+INSERT INTO config
 (id, value)
-VALUES (?, ?);
+VALUES (?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    value = excluded.value
+;
         "#,
         )
         .bind("quote_ttl")

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

@@ -130,9 +130,22 @@ impl WalletDatabase for WalletSqliteDatabase {
 
         sqlx::query(
             r#"
-INSERT OR REPLACE INTO mint
+INSERT INTO mint
 (mint_url, name, pubkey, version, description, description_long, contact, nuts, icon_url, urls, motd, mint_time)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(mint_url) DO UPDATE SET
+    name = excluded.name,
+    pubkey = excluded.pubkey,
+    version = excluded.version,
+    description = excluded.description,
+    description_long = excluded.description_long,
+    contact = excluded.contact,
+    nuts = excluded.nuts,
+    icon_url = excluded.icon_url,
+    urls = excluded.urls,
+    motd = excluded.motd,
+    mint_time = excluded.mint_time
+;
         "#,
         )
         .bind(mint_url.to_string())
@@ -345,9 +358,18 @@ WHERE id=?
     async fn add_mint_quote(&self, quote: MintQuote) -> Result<(), Self::Err> {
         sqlx::query(
             r#"
-INSERT OR REPLACE INTO mint_quote
+INSERT INTO mint_quote
 (id, mint_url, amount, unit, request, state, expiry, secret_key)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    mint_url = excluded.mint_url,
+    amount = excluded.amount,
+    unit = excluded.unit,
+    request = excluded.request,
+    state = excluded.state,
+    expiry = excluded.expiry,
+    secret_key = excluded.secret_key
+;
         "#,
         )
         .bind(quote.id.to_string())
@@ -429,9 +451,17 @@ WHERE id=?
     async fn add_melt_quote(&self, quote: wallet::MeltQuote) -> Result<(), Self::Err> {
         sqlx::query(
             r#"
-INSERT OR REPLACE INTO melt_quote
+INSERT INTO melt_quote
 (id, unit, amount, request, fee_reserve, state, expiry)
-VALUES (?, ?, ?, ?, ?, ?, ?);
+VALUES (?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    unit = excluded.unit,
+    amount = excluded.amount,
+    request = excluded.request,
+    fee_reserve = excluded.fee_reserve,
+    state = excluded.state,
+    expiry = excluded.expiry
+;
         "#,
         )
         .bind(quote.id.to_string())
@@ -492,9 +522,12 @@ WHERE id=?
     async fn add_keys(&self, keys: Keys) -> Result<(), Self::Err> {
         sqlx::query(
             r#"
-INSERT OR REPLACE INTO key
+INSERT INTO key
 (id, keys)
-VALUES (?, ?);
+VALUES (?, ?)
+ON CONFLICT(id) DO UPDATE SET
+    keys = excluded.keys
+;
         "#,
         )
         .bind(Id::from(&keys).to_string())
@@ -556,9 +589,20 @@ WHERE id=?
         for proof in added {
             sqlx::query(
                 r#"
-    INSERT OR REPLACE INTO proof
+    INSERT INTO proof
     (y, mint_url, state, spending_condition, unit, amount, keyset_id, secret, c, witness)
-    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    ON CONFLICT(y) DO UPDATE SET
+        mint_url = excluded.mint_url,
+        state = excluded.state,
+        spending_condition = excluded.spending_condition,
+        unit = excluded.unit,
+        amount = excluded.amount,
+        keyset_id = excluded.keyset_id,
+        secret = excluded.secret,
+        c = excluded.c,
+        witness = excluded.witness
+    ;
             "#,
             )
             .bind(proof.y.to_bytes().to_vec())
@@ -765,9 +809,12 @@ WHERE key=?;
     ) -> Result<(), Self::Err> {
         sqlx::query(
             r#"
-INSERT OR REPLACE INTO nostr_last_checked
+INSERT INTO nostr_last_checked
 (key, last_check)
-VALUES (?, ?);
+VALUES (?, ?)
+ON CONFLICT(key) DO UPDATE SET
+    last_check = excluded.last_check
+;
         "#,
         )
         .bind(verifying_key.to_bytes().to_vec())