diff --git a/migration.sql b/migration.sql
index 12843fe..1ee6de0 100644
--- a/migration.sql
+++ b/migration.sql
@@ -1,7 +1,7 @@
 CREATE SCHEMA banking_stage_results_2;
 
 CREATE TABLE banking_stage_results_2.transactions(
-  signature text primary key,
+  signature char(88) primary key,
   transaction_id bigserial,
   UNIQUE(transaction_id)
 );
@@ -35,8 +35,8 @@ CREATE INDEX idx_transaction_slot_slot ON banking_stage_results_2.transaction_sl
 
 CREATE TABLE banking_stage_results_2.blocks (
   slot BIGINT PRIMARY KEY,
-  block_hash text,
-  leader_identity text,
+  block_hash char(44),
+  leader_identity char(44),
   successful_transactions BIGINT,
   processed_transactions BIGINT,
   total_cu_used BIGINT,
@@ -59,8 +59,6 @@ CREATE TABLE banking_stage_results_2.accounts_map_transaction(
   PRIMARY KEY (transaction_id, acc_id)
 );
 
-ALTER TABLE banking_stage_results_2.accounts_map_transaction ADD COLUMN is_atl BOOL;
-
 CREATE INDEX accounts_map_transaction_acc_id ON banking_stage_results_2.accounts_map_transaction(acc_id);
 CREATE INDEX accounts_map_transaction_transaction_id ON banking_stage_results_2.accounts_map_transaction(transaction_id);
 
@@ -122,8 +120,6 @@ VACUUM FULL banking_stage_results_2.blocks;
 CLUSTER banking_stage_results_2.transaction_slot using idx_transaction_slot_timestamp;
 VACUUM FULL banking_stage_results_2.transaction_slot;
 
-ALTER TABLE banking_stage_results_2.transactions ALTER COLUMN signature TYPE TEXT;
-
 CLUSTER banking_stage_results_2.accounts_map_transaction using accounts_map_transaction_pkey;
 
 CLUSTER banking_stage_results_2.transactions using transactions_pkey;
diff --git a/src/postgres.rs b/src/postgres.rs
index 1b48ef8..9704dc9 100644
--- a/src/postgres.rs
+++ b/src/postgres.rs
@@ -134,7 +134,7 @@ impl PostgresSession {
                 format!(
                     r#"
         CREATE TEMP TABLE {}(
-            signature text
+            signature char(88)
         );
         "#,
                     temp_table
@@ -307,8 +307,8 @@ impl PostgresSession {
             .execute(
                 format!(
                     "CREATE TEMP TABLE {}(
-            account_key text,
-            signature text,
+            account_key char(44),
+            signature char(88),
             is_writable BOOL,
             is_signer BOOL,
             is_atl BOOL
@@ -381,7 +381,7 @@ impl PostgresSession {
             .execute(
                 format!(
                     "CREATE TEMP TABLE {}(
-            signature text,
+            signature char(88),
             processed_slot BIGINT,
             is_successful BOOL,
             cu_requested BIGINT,
@@ -470,7 +470,7 @@ impl PostgresSession {
             .execute(
                 format!(
                     "CREATE TEMP TABLE {}(
-            account_key TEXT,
+            account_key char(44),
             slot BIGINT,
             is_write_locked BOOL,
             total_cu_requested BIGINT,