diff --git a/db/migrations/20250612223204_initial_schema.sql b/db/migrations/20250612223204_initial_schema.sql
index f52b19b..b95abd4 100644
--- a/db/migrations/20250612223204_initial_schema.sql
+++ b/db/migrations/20250612223204_initial_schema.sql
@@ -19,7 +19,7 @@ CREATE TABLE session (
   label VARCHAR,
   -- Participants in participant
 
-  created_at VARCHAR NOT NULL,
+  created_at VARCHAR,
   indexed_at VARCHAR NOT NULL,
   sort_at VARCHAR GENERATED ALWAYS AS (LEAST(created_at,indexed_at)) STORED NOT NULL
 );
@@ -33,13 +33,13 @@ CREATE TABLE activity (
   -- Progress in progress
 
   performed_at VARCHAR,
-  created_at VARCHAR NOT NULL,
+  created_at VARCHAR,
   indexed_at VARCHAR NOT NULL,
   sort_at VARCHAR GENERATED ALWAYS AS (LEAST(created_at,indexed_at)) STORED NOT NULL
 );
 
 CREATE TABLE participant (
   participantdid VARCHAR NOT NULL,
-  session VARCHAR NOT NULL,
+  sessionuri VARCHAR NOT NULL,
   role VARCHAR NOT NULL
 );
diff --git a/db/src/error.rs b/db/src/error.rs
index ed1b585..1c330bc 100644
--- a/db/src/error.rs
+++ b/db/src/error.rs
@@ -3,6 +3,8 @@
 pub enum Error {
   #[error("Database Implementation Error: {0}")]
   Backend(#[from] sqlx::Error),
+  #[error("AT Protocol Implementation Error: {0}")]
+  Atproto(#[from] atproto::error::Error),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;