diff --git a/manifest b/manifest
index b41bd381a..05f46ecaf 100644
--- a/manifest
+++ b/manifest
@@ -55,4 +55,6 @@ default_gender_to_null.sql
 subscribe_email.sql
 notifications.sql
 notification_type_col_rename.sql
-notifications_add_friend_req_id.sql
\ No newline at end of file
+notifications_add_friend_req_id.sql
+artifact_metadata.sql
+mixes.sql
diff --git a/up/artifact_metadata.sql b/up/artifact_metadata.sql
new file mode 100644
index 000000000..77905a8d3
--- /dev/null
+++ b/up/artifact_metadata.sql
@@ -0,0 +1,3 @@
+-- add a size field and make md5 required
+ALTER TABLE artifact_updates ADD COLUMN size INTEGER NOT NULL;
+ALTER TABLE artifact_updates ALTER COLUMN sha1 SET NOT NULL;
diff --git a/up/mixes.sql b/up/mixes.sql
new file mode 100644
index 000000000..376dc2d30
--- /dev/null
+++ b/up/mixes.sql
@@ -0,0 +1,18 @@
+-- mixes
+CREATE TABLE mixes(
+    id VARCHAR(64) PRIMARY KEY DEFAULT uuid_generate_v4(),
+    recording_id VARCHAR(64) NOT NULL REFERENCES recordings(id) ON DELETE CASCADE,
+    owner_id VARCHAR(64) NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    description VARCHAR(1024) NOT NULL,
+    spec TEXT NOT NULL,
+    url VARCHAR(512) DEFAULT NULL,
+    mix_server VARCHAR(64) DEFAULT NULL,
+    started_at TIMESTAMP DEFAULT NULL,
+    completed_at TIMESTAMP DEFAULT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX index_started_at ON mixes USING btree (started_at);
+CREATE INDEX index_completed_at ON mixes USING btree (completed_at);
+