Implement --prefix for the DB inspector

quickpeep_raker/src/bin/qp-raker-db.rs

@@ -1,4 +1,5 @@
 use clap::Parser;
+use std::borrow::Cow;
 
 use std::fmt::Debug;
 
@@ -85,13 +86,22 @@ impl<T: Debug> Inspectable for MdbxBare<T> {
     }
 }
 
-fn inspect<'a, IV: Inspectable + TableObject<'a>>(
+fn inspect<'a, IV: Inspectable + TableObject<'a> + 'static>(
     key: &str,
     prefix: bool,
     database: &Database<'a>,
     txn: &'a RakerTxn<'a, RO>,
 ) -> anyhow::Result<()> {
     if prefix {
+        let mut cur = txn.mdbx_txn.cursor(database)?;
+        for item in cur.iter_from::<Cow<'_, [u8]>, IV>(key.as_bytes()) {
+            let (k, v) = item?;
+            if !k.starts_with(key.as_bytes()) {
+                break;
+            }
+            println!("• {}", std::str::from_utf8(&k).unwrap_or("<Not UTF-8>"));
+            println!("  = {}", v.inspect());
+        }
     } else {
         if let Some(entry) = txn.mdbx_txn.get::<IV>(database, key.as_bytes())? {
             println!("{}", entry.inspect());