diff --git a/internal/db/migrations/1750328591_add_column_contributors_url.up.sql b/internal/db/migrations/1750328591_add_column_contributors_url.up.sql
index cc05125..c05df31 100644
--- a/internal/db/migrations/1750328591_add_column_contributors_url.up.sql
+++ b/internal/db/migrations/1750328591_add_column_contributors_url.up.sql
@@ -1,5 +1 @@
-ALTER TABLE repositories ADD COLUMN contributors_url VARCHAR(255);
-
-UPDATE repositories SET contributors_url = '' WHERE contributors_url IS NULL;
-
-ALTER TABLE repositories ALTER COLUMN contributors_url SET NOT NULL;
+ALTER TABLE repositories ADD COLUMN contributors_url VARCHAR(255) DEFAULT '';
\ No newline at end of file
diff --git a/internal/db/migrations/1751016438_allow-null-contribution-id.down.sql b/internal/db/migrations/1751016438_allow-null-contribution-id.down.sql
new file mode 100644
index 0000000..ff2f133
--- /dev/null
+++ b/internal/db/migrations/1751016438_allow-null-contribution-id.down.sql
@@ -0,0 +1,2 @@
+ALTER TABLE transactions
+ALTER COLUMN contribution_id SET NOT NULL;
\ No newline at end of file
diff --git a/internal/db/migrations/1751016438_allow-null-contribution-id.up.sql b/internal/db/migrations/1751016438_allow-null-contribution-id.up.sql
new file mode 100644
index 0000000..8f9e5d0
--- /dev/null
+++ b/internal/db/migrations/1751016438_allow-null-contribution-id.up.sql
@@ -0,0 +1,2 @@
+ALTER TABLE transactions
+ALTER COLUMN contribution_id DROP NOT NULL;
diff --git a/internal/db/migrations/1751028730_add-gh-event-id.down.sql b/internal/db/migrations/1751028730_add-gh-event-id.down.sql
new file mode 100644
index 0000000..a63e61f
--- /dev/null
+++ b/internal/db/migrations/1751028730_add-gh-event-id.down.sql
@@ -0,0 +1 @@
+ALTER TABLE contributions DROP COLUMN github_event_id;
\ No newline at end of file
diff --git a/internal/db/migrations/1751028730_add-gh-event-id.up.sql b/internal/db/migrations/1751028730_add-gh-event-id.up.sql
new file mode 100644
index 0000000..334b976
--- /dev/null
+++ b/internal/db/migrations/1751028730_add-gh-event-id.up.sql
@@ -0,0 +1 @@
+ALTER TABLE contributions ADD COLUMN github_event_id VARCHAR(255) DEFAULT '';
\ No newline at end of file
diff --git a/internal/db/migrations/1751266661_set-not-null-contributors-url.down.sql b/internal/db/migrations/1751266661_set-not-null-contributors-url.down.sql
new file mode 100644
index 0000000..7645eb9
--- /dev/null
+++ b/internal/db/migrations/1751266661_set-not-null-contributors-url.down.sql
@@ -0,0 +1 @@
+ALTER TABLE repositories ALTER COLUMN contributors_url DROP NOT NULL;
\ No newline at end of file
diff --git a/internal/db/migrations/1751266661_set-not-null-contributors-url.up.sql b/internal/db/migrations/1751266661_set-not-null-contributors-url.up.sql
new file mode 100644
index 0000000..bba0f67
--- /dev/null
+++ b/internal/db/migrations/1751266661_set-not-null-contributors-url.up.sql
@@ -0,0 +1 @@
+ALTER TABLE repositories ALTER COLUMN contributors_url SET NOT NULL;
\ No newline at end of file
diff --git a/internal/db/migrations/1751268286_set-not-null-gh-event-id.down.sql b/internal/db/migrations/1751268286_set-not-null-gh-event-id.down.sql
new file mode 100644
index 0000000..5828c2e
--- /dev/null
+++ b/internal/db/migrations/1751268286_set-not-null-gh-event-id.down.sql
@@ -0,0 +1 @@
+ALTER TABLE contributions ALTER COLUMN github_event_id DROP NOT NULL;
\ No newline at end of file
diff --git a/internal/db/migrations/1751268286_set-not-null-gh-event-id.up.sql b/internal/db/migrations/1751268286_set-not-null-gh-event-id.up.sql
new file mode 100644
index 0000000..2ac1f91
--- /dev/null
+++ b/internal/db/migrations/1751268286_set-not-null-gh-event-id.up.sql
@@ -0,0 +1 @@
+ALTER TABLE contributions ALTER COLUMN github_event_id SET NOT NULL;
\ No newline at end of file