diff --git a/bin/migrate-codes/migrate.rs b/bin/migrate-codes/migrate.rs
index 6d0eba3..f4bf7dc 100644
--- a/bin/migrate-codes/migrate.rs
+++ b/bin/migrate-codes/migrate.rs
@@ -1,9 +1,7 @@
-use std::time::Duration;
-
 use clap::Parser;
 use iris_db::IrisCodeEntry;
-use itertools::Itertools;
 use mpc::bits::Bits;
+use mpc::db::Db;
 use mpc::distance::EncodedBits;
 use mpc::template::Template;
 use rand::thread_rng;
@@ -18,16 +16,22 @@ mod mpc_db;
 
 #[derive(Parser)]
 pub struct Args {
-    #[clap(long, env)]
+    /// Connection string for the iris MongoDB
+    #[clap(alias = "ic", long, env)]
     pub iris_code_db: String,
-    #[clap(long, env)]
+    /// Connection string for the left coordinator Postgres DB
+    #[clap(alias = "lc", long, env)]
     pub left_coordinator_db: String,
-    #[clap(long, env)]
+    /// Connection strings for the left participant Postgres DBs
+    #[clap(alias = "lp", long, env)]
     pub left_participant_db: Vec<String>,
-    #[clap(long, env)]
+    /// Connection strings for the right coordinator Postgres DBs
+    #[clap(alias = "rc", long, env)]
     pub right_coordinator_db: String,
-    #[clap(long, env)]
+    /// Connection string for the right participant Postgres DB
+    #[clap(alias = "rp", long, env)]
     pub right_participant_db: Vec<String>,
+
     #[clap(long, env, default_value = "10000")]
     pub batch_size: usize,
 }
@@ -38,7 +42,9 @@ async fn main() -> eyre::Result<()> {
 
     let args = Args::parse();
 
-    assert_eq!(
+    eyre::ensure!(
+        args.left_participant_db.len() == args.right_participant_db.len(),
+        "Number of participants on left & right must match (left: {}, right: {})",
         args.left_participant_db.len(),
         args.right_participant_db.len()
     );
@@ -64,7 +70,19 @@ async fn main() -> eyre::Result<()> {
     let left_data = encode_shares(left_templates, num_participants as usize)?;
     let right_data = encode_shares(right_templates, num_participants as usize)?;
 
-    //TODO: insert in chunks
+    insert_masks_and_shares(
+        &left_data,
+        &mpc_db.left_coordinator_db,
+        &mpc_db.left_participant_dbs,
+    )
+    .await?;
+
+    insert_masks_and_shares(
+        &right_data,
+        &mpc_db.right_coordinator_db,
+        &mpc_db.right_participant_dbs,
+    )
+    .await?;
 
     Ok(())
 }
@@ -120,3 +138,29 @@ pub fn extract_templates(
 
     (left_templates, right_templates)
 }
+
+async fn insert_masks_and_shares(
+    data: &[(usize, Bits, Box<[EncodedBits]>)],
+    coordinator_db: &Db,
+    participant_dbs: &[Db],
+) -> eyre::Result<()> {
+    // Insert masks
+    let left_masks: Vec<_> = data
+        .iter()
+        .map(|(serial_id, mask, _)| (*serial_id as u64, mask.clone()))
+        .collect();
+
+    coordinator_db.insert_masks(&left_masks).await?;
+
+    // Insert shares to each participant
+    for (i, participant_db) in participant_dbs.iter().enumerate() {
+        let shares: Vec<_> = data
+            .iter()
+            .map(|(serial_id, _, shares)| (*serial_id as u64, shares[i]))
+            .collect();
+
+        participant_db.insert_shares(&shares).await?;
+    }
+
+    Ok(())
+}