diff --git a/src/identity/adapters/output/db/mod.rs b/src/identity/adapters/output/db/mod.rs
new file mode 100644
index 0000000..6be5441
--- /dev/null
+++ b/src/identity/adapters/output/db/mod.rs
@@ -0,0 +1,5 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+pub mod postgres;
diff --git a/src/identity/adapters/output/db/postgres/errors.rs b/src/identity/adapters/output/db/postgres/errors.rs
new file mode 100644
index 0000000..d9772e9
--- /dev/null
+++ b/src/identity/adapters/output/db/postgres/errors.rs
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::borrow::Cow;
+
+use sqlx::Error as SqlxError;
+
+use crate::identity::application::port::output::db::errors::OutDBPortError;
+
+impl From<SqlxError> for OutDBPortError {
+    fn from(e: SqlxError) -> Self {
+        log::error!("[postgres] err: {}", e);
+        if let SqlxError::Database(err) = e {
+            if err.code() == Some(Cow::from("23505")) {
+                let msg = err.message();
+                if msg.contains("user_query_username_key") {
+                    return Self::InternalError;
+                } else if msg.contains("user_query_email_key") {
+                    return Self::InternalError;
+                } else if msg.contains("verification_otp_secret_key") {
+                    return Self::VerificationOTPSecretExists;
+                } else {
+                    println!("{msg}");
+                }
+            }
+        }
+        Self::InternalError
+    }
+}
diff --git a/src/identity/adapters/output/db/postgres/mod.rs b/src/identity/adapters/output/db/postgres/mod.rs
new file mode 100644
index 0000000..c6f79ca
--- /dev/null
+++ b/src/identity/adapters/output/db/postgres/mod.rs
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+//use crate::auth::application::port::out::db::save_oauth_state::SaveOAuthState;
+use std::sync::Arc;
+
+use sqlx::postgres::PgPool;
+
+use crate::db::{migrate::RunMigrations, sqlx_postgres::Postgres};
+
+pub mod create_verification_secret;
+pub mod email_exists;
+mod errors;
+pub mod username_exists;
+
+#[derive(Clone)]
+pub struct DBOutPostgresAdapter {
+    pool: PgPool,
+}
+
+impl DBOutPostgresAdapter {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+
+    pub fn migratable(&self) -> Arc<dyn RunMigrations> {
+        Arc::new(Postgres::new(self.pool.clone()))
+    }
+}