diff --git a/src/msp.rs b/src/msp.rs
index a27f77f..6a8eac2 100644
--- a/src/msp.rs
+++ b/src/msp.rs
@@ -7,9 +7,13 @@ autoerr::create_error_v1!(
     enum variants {
         PrebinnedPartitioningInvalid,
         BadDv1(u32),
+        BadPbp(u32),
     },
 );
 
+#[derive(Debug, Clone)]
+pub struct MspU32(pub u32);
+
 #[derive(Debug, Clone)]
 pub enum PrebinnedPartitioning {
     Sec1,
@@ -114,6 +118,19 @@ impl PrebinnedPartitioning {
             Day1 => 6,
         }
     }
+
+    pub fn from_db_ix(x: u32) -> Result<Self, Error> {
+        use PrebinnedPartitioning::*;
+        match x {
+            1 => Ok(Sec1),
+            2 => Ok(Sec10),
+            3 => Ok(Min1),
+            4 => Ok(Min10),
+            5 => Ok(Hour1),
+            6 => Ok(Day1),
+            _ => Err(Error::BadPbp(x)),
+        }
+    }
 }
 
 impl TryFrom<DtMs> for PrebinnedPartitioning {