diff --git a/services/backup/src/constants.rs b/services/backup/src/constants.rs
--- a/services/backup/src/constants.rs
+++ b/services/backup/src/constants.rs
@@ -4,32 +4,6 @@
 pub const ID_SEPARATOR: &str = ":";
 pub const ATTACHMENT_HOLDER_SEPARATOR: &str = ";";
 
-// 400KiB limit (in docs there is KB but they mean KiB) -
-// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ServiceQuotas.html
-// This includes both attribute names' and values' lengths
-//
-// This has to be smaller than GRPC_CHUNK_SIZE_LIMIT because we need to
-// recognize if we may receive multiple chunks or just one. If it was larger
-// than the chunk limit, once we get the amount of data of size equal to the
-// limit, we wouldn't know if we should put this in the database right away or
-// wait for more data.
-pub const LOG_DATA_SIZE_DATABASE_LIMIT: usize = 1024 * 400;
-
-// 4MB limit
-// WARNING: use keeping in mind that grpc adds its own headers to messages
-// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
-// so the message that actually is being sent over the network looks like this
-// [Compressed-Flag] [Message-Length] [Message]
-//    [Compressed-Flag]   1 byte  - added by grpc
-//    [Message-Length]    4 bytes - added by grpc
-//    [Message]           N bytes - actual data
-// so for every message we get 5 additional bytes of data
-// as mentioned here
-// https://github.com/grpc/grpc/issues/15734#issuecomment-396962671
-// grpc stream may contain more than one message
-pub const GRPC_CHUNK_SIZE_LIMIT: usize = 4 * 1024 * 1024;
-pub const GRPC_METADATA_SIZE_PER_MESSAGE: usize = 5;
-
 // Configuration defaults
 pub const DEFAULT_BLOB_SERVICE_URL: &str = "http://localhost:50053";
 
diff --git a/services/comm-services-lib/src/constants.rs b/services/comm-services-lib/src/constants.rs
new file mode 100644
--- /dev/null
+++ b/services/comm-services-lib/src/constants.rs
@@ -0,0 +1,19 @@
+// 400KiB limit (in docs there is KB but they mean KiB) -
+// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ServiceQuotas.html
+// This includes both attribute names' and values' lengths
+pub const DDB_ITEM_SIZE_LIMIT: usize = 1024 * 400;
+
+// 4MB limit
+// WARNING: use keeping in mind that grpc adds its own headers to messages
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
+// so the message that actually is being sent over the network looks like this
+// [Compressed-Flag] [Message-Length] [Message]
+//    [Compressed-Flag]   1 byte  - added by grpc
+//    [Message-Length]    4 bytes - added by grpc
+//    [Message]           N bytes - actual data
+// so for every message we get 5 additional bytes of data
+// as mentioned here
+// https://github.com/grpc/grpc/issues/15734#issuecomment-396962671
+// grpc stream may contain more than one message
+pub const GRPC_CHUNK_SIZE_LIMIT: usize = 4 * 1024 * 1024;
+pub const GRPC_METADATA_SIZE_PER_MESSAGE: usize = 5;
diff --git a/services/comm-services-lib/src/lib.rs b/services/comm-services-lib/src/lib.rs
--- a/services/comm-services-lib/src/lib.rs
+++ b/services/comm-services-lib/src/lib.rs
@@ -1,4 +1,5 @@
 pub mod blob;
+pub mod constants;
 pub mod database;
 #[cfg(feature = "http")]
 pub mod http;