diff --git a/backend/app/main.py b/backend/app/main.py
index 26d1d7a..a9717fe 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -55,6 +55,10 @@ def run_migrations() -> None:
         if "mission_submissions" in tables:
             submission_columns = {column["name"] for column in inspector.get_columns("mission_submissions")}
 
+        mission_columns = set()
+        if "missions" in tables:
+            mission_columns = {column["name"] for column in inspector.get_columns("missions")}
+
         with engine.begin() as conn:
             if "preferred_branch" not in user_columns:
                 conn.execute(text("ALTER TABLE users ADD COLUMN preferred_branch VARCHAR(160)"))
@@ -70,6 +74,39 @@ def run_migrations() -> None:
             if "resume_link" not in submission_columns:
                 conn.execute(text("ALTER TABLE mission_submissions ADD COLUMN resume_link VARCHAR(512)"))
 
+            if "missions" in tables:
+                # Легаси-базы без alembic_version пропускали миграцию с офлайн-полями,
+                # поэтому докидываем недостающие колонки вручную, чтобы API /admin не падало.
+                if "format" not in mission_columns:
+                    conn.execute(
+                        text(
+                            "ALTER TABLE missions ADD COLUMN format VARCHAR(20) NOT NULL DEFAULT 'online'"
+                        )
+                    )
+                    conn.execute(text("UPDATE missions SET format = 'online' WHERE format IS NULL"))
+                if "event_location" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN event_location VARCHAR(160)"))
+                if "event_address" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN event_address VARCHAR(255)"))
+                if "event_starts_at" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN event_starts_at TIMESTAMP"))
+                if "event_ends_at" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN event_ends_at TIMESTAMP"))
+                if "registration_deadline" not in mission_columns:
+                    conn.execute(
+                        text("ALTER TABLE missions ADD COLUMN registration_deadline TIMESTAMP")
+                    )
+                if "registration_url" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN registration_url VARCHAR(512)"))
+                if "registration_notes" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN registration_notes TEXT"))
+                if "capacity" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN capacity INTEGER"))
+                if "contact_person" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN contact_person VARCHAR(120)"))
+                if "contact_phone" not in mission_columns:
+                    conn.execute(text("ALTER TABLE missions ADD COLUMN contact_phone VARCHAR(64)"))
+
             conn.execute(text("CREATE TABLE IF NOT EXISTS alembic_version (version_num VARCHAR(32) NOT NULL)"))
             conn.execute(text("DELETE FROM alembic_version"))
             conn.execute(text("INSERT INTO alembic_version (version_num) VALUES (:rev)"), {"rev": head_revision})