Implement recoverable exact result deletion

crates/remora-deletion/src/error.rs

@@ -0,0 +1,25 @@
+use remora_durable::DurableError;
+
+#[derive(Debug, thiserror::Error)]
+pub enum DeletionError {
+    #[error("resource not found")]
+    NotFound,
+    #[error("job is not terminal")]
+    NotTerminal,
+    #[error("hard deletion has already started")]
+    HardDeleteStarted,
+    #[error("committed result inventory is corrupt")]
+    CorruptInventory,
+    #[error("deletion claim is no longer authoritative")]
+    ClaimLost,
+    #[error("invalid deletion configuration: {0}")]
+    InvalidConfig(String),
+    #[error("durable deletion operation failed: {0}")]
+    Durable(#[from] DurableError),
+}
+
+impl From<sqlx::Error> for DeletionError {
+    fn from(error: sqlx::Error) -> Self {
+        Self::Durable(DurableError::Database(error))
+    }
+}