diff --git a/scnserver/Dockerfile b/scnserver/Dockerfile
index ede78a5..1ffa44e 100644
--- a/scnserver/Dockerfile
+++ b/scnserver/Dockerfile
@@ -7,6 +7,12 @@ RUN make build
 
 FROM debian:bookworm
 
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates && \
+    apt-get install -y --no-install-recommends tzdata          && \
+    rm -rf /var/cache/apt/archives && \
+    rm -rf /var/lib/apt/lists
+
 COPY --from=builder /repo/_build/scn_backend /app/scnserver
 
 COPY DOCKER_GIT_INFO    /app/DOCKER_GIT_INFO
diff --git a/scnserver/db/impl/primary/schema/schema_3.ddl b/scnserver/db/impl/primary/schema/schema_3.ddl
index de57bc1..5e5d01b 100644
--- a/scnserver/db/impl/primary/schema/schema_3.ddl
+++ b/scnserver/db/impl/primary/schema/schema_3.ddl
@@ -185,7 +185,7 @@ CREATE TABLE deliveries
 
     status              TEXT     CHECK(status IN ('RETRY','SUCCESS','FAILED'))   NOT NULL,
     retry_count         INTEGER                                                  NOT NULL   DEFAULT 0,
-    next_delivery       INTEGER                                                      NULL   DEFAULT NULL,
+    next_delivery       TEXT                                                         NULL   DEFAULT NULL,
 
     fcm_message_id      TEXT                                                         NULL,