fix stor insert/delete collision (#15838)

# Description

Based on some testing in
[Discord](https://discord.com/channels/601130461678272522/1349836000804995196/1353138803640111135)
we were able to find that `insert` and `delete` happening at the same
time caused problems in the `stor` command. So, I added `conn.is_busy()`
with a sleep to try and avoid that problem.


![image](https://github.com/user-attachments/assets/e01bccab-0aaa-40ab-b0bf-25e3c72aa037)

/cc @NotTheDr01ds @132ikl 

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crates/nu-command/src/database/values/sqlite.rs

@@ -112,16 +112,31 @@ impl SQLiteDatabase {
         if self.path == PathBuf::from(MEMORY_DB) {
             open_connection_in_memory_custom()
         } else {
-            Connection::open(&self.path).map_err(|e| ShellError::GenericError {
+            let conn = Connection::open(&self.path).map_err(|e| ShellError::GenericError {
                 error: "Failed to open SQLite database from open_connection".into(),
                 msg: e.to_string(),
                 span: None,
                 help: None,
                 inner: vec![],
-            })
+            })?;
+            conn.busy_handler(Some(SQLiteDatabase::sleeper))
+                .map_err(|e| ShellError::GenericError {
+                    error: "Failed to set busy handler for SQLite database".into(),
+                    msg: e.to_string(),
+                    span: None,
+                    help: None,
+                    inner: vec![],
+                })?;
+            Ok(conn)
         }
     }
 
+    fn sleeper(attempts: i32) -> bool {
+        log::warn!("SQLITE_BUSY, retrying after 250ms (attempt {})", attempts);
+        std::thread::sleep(std::time::Duration::from_millis(250));
+        true
+    }
+
     pub fn get_tables(&self, conn: &Connection) -> Result<Vec<DbTable>, SqliteError> {
         let mut table_names =
             conn.prepare("SELECT name FROM sqlite_master WHERE type = 'table'")?;
@@ -668,13 +683,23 @@ pub fn convert_sqlite_value_to_nu_value(value: ValueRef, span: Span) -> Value {
 
 pub fn open_connection_in_memory_custom() -> Result<Connection, ShellError> {
     let flags = OpenFlags::default();
+    let conn =
         Connection::open_with_flags(MEMORY_DB, flags).map_err(|e| ShellError::GenericError {
             error: "Failed to open SQLite custom connection in memory".into(),
             msg: e.to_string(),
             span: Some(Span::test_data()),
             help: None,
             inner: vec![],
-    })
+        })?;
+    conn.busy_handler(Some(SQLiteDatabase::sleeper))
+        .map_err(|e| ShellError::GenericError {
+            error: "Failed to set busy handler for SQLite custom connection in memory".into(),
+            msg: e.to_string(),
+            span: Some(Span::test_data()),
+            help: None,
+            inner: vec![],
+        })?;
+    Ok(conn)
 }
 
 pub fn open_connection_in_memory() -> Result<Connection, ShellError> {

crates/nu-command/src/stor/delete.rs

@@ -109,7 +109,9 @@ impl Command for StorDelete {
                 // dbg!(&sql_stmt);
                 conn.execute(&sql_stmt, [])
                     .map_err(|err| ShellError::GenericError {
-                        error: "Failed to open SQLite connection in memory from delete".into(),
+                        error:
+                            "Failed to delete using the SQLite connection in memory from delete.rs."
+                                .into(),
                         msg: err.to_string(),
                         span: Some(Span::test_data()),
                         help: None,

crates/nu-command/src/stor/insert.rs

@@ -164,7 +164,6 @@ fn process(
     }
     let new_table_name = table_name.unwrap_or("table".into());
 
-    if let Ok(conn) = db.open_connection() {
     let mut create_stmt = format!("INSERT INTO {} (", new_table_name);
     let mut column_placeholders: Vec<String> = Vec::new();
 
@@ -189,9 +188,11 @@ fn process(
     // Get the params from the passed values
     let params = values_to_sql(record.values().cloned())?;
 
+    if let Ok(conn) = db.open_connection() {
         conn.execute(&create_stmt, params_from_iter(params))
             .map_err(|err| ShellError::GenericError {
-                error: "Failed to open SQLite connection in memory from insert".into(),
+                error: "Failed to insert using the SQLite connection in memory from insert.rs."
+                    .into(),
                 msg: err.to_string(),
                 span: Some(Span::test_data()),
                 help: None,