diff --git a/crates/adapters/postgres/src/boost.rs b/crates/adapters/postgres/src/boost.rs
index d72d75d..a1f0431 100644
--- a/crates/adapters/postgres/src/boost.rs
+++ b/crates/adapters/postgres/src/boost.rs
@@ -1,2 +1,80 @@
-pub struct PgBoostRepository { _pool: sqlx::PgPool }
-impl PgBoostRepository { pub fn new(pool: sqlx::PgPool) -> Self { Self { _pool: pool } } }
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use sqlx::PgPool;
+use domain::{errors::DomainError, models::social::Boost, ports::BoostRepository, value_objects::{BoostId, ThoughtId, UserId}};
+
+pub struct PgBoostRepository { pool: PgPool }
+impl PgBoostRepository { pub fn new(pool: PgPool) -> Self { Self { pool } } }
+
+#[async_trait]
+impl BoostRepository for PgBoostRepository {
+    async fn save(&self, b: &Boost) -> Result<(), DomainError> {
+        sqlx::query(
+            "INSERT INTO boosts(id,user_id,thought_id,ap_id,created_at) VALUES($1,$2,$3,$4,$5) ON CONFLICT(user_id,thought_id) DO NOTHING"
+        )
+        .bind(b.id.as_uuid()).bind(b.user_id.as_uuid()).bind(b.thought_id.as_uuid()).bind(&b.ap_id).bind(b.created_at)
+        .execute(&self.pool).await.map_err(|e| DomainError::Internal(e.to_string())).map(|_| ())
+    }
+
+    async fn delete(&self, user_id: &UserId, thought_id: &ThoughtId) -> Result<(), DomainError> {
+        let r = sqlx::query("DELETE FROM boosts WHERE user_id=$1 AND thought_id=$2")
+            .bind(user_id.as_uuid()).bind(thought_id.as_uuid())
+            .execute(&self.pool).await.map_err(|e| DomainError::Internal(e.to_string()))?;
+        if r.rows_affected() == 0 { return Err(DomainError::NotFound); }
+        Ok(())
+    }
+
+    async fn find(&self, user_id: &UserId, thought_id: &ThoughtId) -> Result<Option<Boost>, DomainError> {
+        #[derive(sqlx::FromRow)]
+        struct Row { id: uuid::Uuid, user_id: uuid::Uuid, thought_id: uuid::Uuid, ap_id: Option<String>, created_at: DateTime<Utc> }
+        sqlx::query_as::<_, Row>("SELECT id,user_id,thought_id,ap_id,created_at FROM boosts WHERE user_id=$1 AND thought_id=$2")
+            .bind(user_id.as_uuid()).bind(thought_id.as_uuid())
+            .fetch_optional(&self.pool).await
+            .map_err(|e| DomainError::Internal(e.to_string()))
+            .map(|o| o.map(|r| Boost { id: BoostId::from_uuid(r.id), user_id: UserId::from_uuid(r.user_id), thought_id: ThoughtId::from_uuid(r.thought_id), ap_id: r.ap_id, created_at: r.created_at }))
+    }
+
+    async fn count_for_thought(&self, thought_id: &ThoughtId) -> Result<i64, DomainError> {
+        sqlx::query_scalar("SELECT COUNT(*) FROM boosts WHERE thought_id=$1")
+            .bind(thought_id.as_uuid()).fetch_one(&self.pool).await
+            .map_err(|e| DomainError::Internal(e.to_string()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::Utc;
+    use domain::{models::{thought::{Thought, Visibility}, user::User}, value_objects::*};
+    use crate::{thought::PgThoughtRepository, user::PgUserRepository};
+    use domain::ports::{ThoughtRepository, UserRepository};
+
+    async fn seed(pool: &sqlx::PgPool) -> (User, Thought) {
+        let urepo = PgUserRepository::new(pool.clone());
+        let trepo = PgThoughtRepository::new(pool.clone());
+        let u = User::new_local(UserId::new(), Username::new("alice").unwrap(), Email::new("alice@ex.com").unwrap(), PasswordHash("h".into()));
+        urepo.save(&u).await.unwrap();
+        let t = Thought::new_local(ThoughtId::new(), u.id.clone(), Content::new_local("hi").unwrap(), None, Visibility::Public, None, false);
+        trepo.save(&t).await.unwrap();
+        (u, t)
+    }
+
+    #[sqlx::test(migrations = "./migrations")]
+    async fn boost_and_count(pool: sqlx::PgPool) {
+        let (user, thought) = seed(&pool).await;
+        let repo = PgBoostRepository::new(pool);
+        let boost = Boost { id: BoostId::new(), user_id: user.id.clone(), thought_id: thought.id.clone(), ap_id: None, created_at: Utc::now() };
+        repo.save(&boost).await.unwrap();
+        assert_eq!(repo.count_for_thought(&thought.id).await.unwrap(), 1);
+    }
+
+    #[sqlx::test(migrations = "./migrations")]
+    async fn unboost(pool: sqlx::PgPool) {
+        let (user, thought) = seed(&pool).await;
+        let repo = PgBoostRepository::new(pool);
+        let boost = Boost { id: BoostId::new(), user_id: user.id.clone(), thought_id: thought.id.clone(), ap_id: None, created_at: Utc::now() };
+        repo.save(&boost).await.unwrap();
+        repo.delete(&user.id, &thought.id).await.unwrap();
+        assert_eq!(repo.count_for_thought(&thought.id).await.unwrap(), 0);
+    }
+}
diff --git a/crates/adapters/postgres/src/like.rs b/crates/adapters/postgres/src/like.rs
index 6970da9..556d486 100644
--- a/crates/adapters/postgres/src/like.rs
+++ b/crates/adapters/postgres/src/like.rs
@@ -1,2 +1,80 @@
-pub struct PgLikeRepository { _pool: sqlx::PgPool }
-impl PgLikeRepository { pub fn new(pool: sqlx::PgPool) -> Self { Self { _pool: pool } } }
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use sqlx::PgPool;
+use domain::{errors::DomainError, models::social::Like, ports::LikeRepository, value_objects::{LikeId, ThoughtId, UserId}};
+
+pub struct PgLikeRepository { pool: PgPool }
+impl PgLikeRepository { pub fn new(pool: PgPool) -> Self { Self { pool } } }
+
+#[async_trait]
+impl LikeRepository for PgLikeRepository {
+    async fn save(&self, l: &Like) -> Result<(), DomainError> {
+        sqlx::query(
+            "INSERT INTO likes(id,user_id,thought_id,ap_id,created_at) VALUES($1,$2,$3,$4,$5) ON CONFLICT(user_id,thought_id) DO NOTHING"
+        )
+        .bind(l.id.as_uuid()).bind(l.user_id.as_uuid()).bind(l.thought_id.as_uuid()).bind(&l.ap_id).bind(l.created_at)
+        .execute(&self.pool).await.map_err(|e| DomainError::Internal(e.to_string())).map(|_| ())
+    }
+
+    async fn delete(&self, user_id: &UserId, thought_id: &ThoughtId) -> Result<(), DomainError> {
+        let r = sqlx::query("DELETE FROM likes WHERE user_id=$1 AND thought_id=$2")
+            .bind(user_id.as_uuid()).bind(thought_id.as_uuid())
+            .execute(&self.pool).await.map_err(|e| DomainError::Internal(e.to_string()))?;
+        if r.rows_affected() == 0 { return Err(DomainError::NotFound); }
+        Ok(())
+    }
+
+    async fn find(&self, user_id: &UserId, thought_id: &ThoughtId) -> Result<Option<Like>, DomainError> {
+        #[derive(sqlx::FromRow)]
+        struct Row { id: uuid::Uuid, user_id: uuid::Uuid, thought_id: uuid::Uuid, ap_id: Option<String>, created_at: DateTime<Utc> }
+        sqlx::query_as::<_, Row>("SELECT id,user_id,thought_id,ap_id,created_at FROM likes WHERE user_id=$1 AND thought_id=$2")
+            .bind(user_id.as_uuid()).bind(thought_id.as_uuid())
+            .fetch_optional(&self.pool).await
+            .map_err(|e| DomainError::Internal(e.to_string()))
+            .map(|o| o.map(|r| Like { id: LikeId::from_uuid(r.id), user_id: UserId::from_uuid(r.user_id), thought_id: ThoughtId::from_uuid(r.thought_id), ap_id: r.ap_id, created_at: r.created_at }))
+    }
+
+    async fn count_for_thought(&self, thought_id: &ThoughtId) -> Result<i64, DomainError> {
+        sqlx::query_scalar("SELECT COUNT(*) FROM likes WHERE thought_id=$1")
+            .bind(thought_id.as_uuid()).fetch_one(&self.pool).await
+            .map_err(|e| DomainError::Internal(e.to_string()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::Utc;
+    use domain::{models::{thought::{Thought, Visibility}, user::User}, value_objects::*};
+    use crate::{thought::PgThoughtRepository, user::PgUserRepository};
+    use domain::ports::{ThoughtRepository, UserRepository};
+
+    async fn seed(pool: &sqlx::PgPool) -> (User, Thought) {
+        let urepo = PgUserRepository::new(pool.clone());
+        let trepo = PgThoughtRepository::new(pool.clone());
+        let u = User::new_local(UserId::new(), Username::new("alice").unwrap(), Email::new("alice@ex.com").unwrap(), PasswordHash("h".into()));
+        urepo.save(&u).await.unwrap();
+        let t = Thought::new_local(ThoughtId::new(), u.id.clone(), Content::new_local("hi").unwrap(), None, Visibility::Public, None, false);
+        trepo.save(&t).await.unwrap();
+        (u, t)
+    }
+
+    #[sqlx::test(migrations = "./migrations")]
+    async fn like_and_count(pool: sqlx::PgPool) {
+        let (user, thought) = seed(&pool).await;
+        let repo = PgLikeRepository::new(pool);
+        let like = Like { id: LikeId::new(), user_id: user.id.clone(), thought_id: thought.id.clone(), ap_id: None, created_at: Utc::now() };
+        repo.save(&like).await.unwrap();
+        assert_eq!(repo.count_for_thought(&thought.id).await.unwrap(), 1);
+    }
+
+    #[sqlx::test(migrations = "./migrations")]
+    async fn unlike(pool: sqlx::PgPool) {
+        let (user, thought) = seed(&pool).await;
+        let repo = PgLikeRepository::new(pool);
+        let like = Like { id: LikeId::new(), user_id: user.id.clone(), thought_id: thought.id.clone(), ap_id: None, created_at: Utc::now() };
+        repo.save(&like).await.unwrap();
+        repo.delete(&user.id, &thought.id).await.unwrap();
+        assert_eq!(repo.count_for_thought(&thought.id).await.unwrap(), 0);
+    }
+}