chore: Better postgres duplicate insert (#2535)

* postgres_driver: add ON CONFLICT DO NOTHING in the insert statement
* test_driver_postgres: adapt test to ON CONFLICT DO NOTHING
  The insert does not fail when duplicate, it returns a positive response
  when doing 'put' of a duplicated row. The test is adapted so that
  we just check that the number of messages doesn't grow after
  trying to add a duplicated row.

tests/waku_archive/test_driver_postgres.nim

@@ -164,6 +164,9 @@ suite "Postgres driver":
     let msg1 = fakeWakuMessage(ts = now)
     let msg2 = fakeWakuMessage(ts = now)
 
+    let initialNumMsgs = (await driver.getMessagesCount()).valueOr:
+      raiseAssert "could not get num mgs correctly: " & $error
+
     var putRes = await driver.put(
       DefaultPubsubTopic,
       msg1,
@@ -173,6 +176,12 @@ suite "Postgres driver":
     )
     assert putRes.isOk(), putRes.error
 
+    var newNumMsgs = (await driver.getMessagesCount()).valueOr:
+      raiseAssert "could not get num mgs correctly: " & $error
+
+    assert newNumMsgs == (initialNumMsgs + 1.int64),
+      "wrong number of messages: " & $newNumMsgs
+
     putRes = await driver.put(
       DefaultPubsubTopic,
       msg2,
@@ -180,4 +189,11 @@ suite "Postgres driver":
       computeMessageHash(DefaultPubsubTopic, msg2),
       msg2.timestamp,
     )
-    assert not putRes.isOk()
+
+    assert putRes.isOk()
+
+    newNumMsgs = (await driver.getMessagesCount()).valueOr:
+      raiseAssert "could not get num mgs correctly: " & $error
+
+    assert newNumMsgs == (initialNumMsgs + 1.int64),
+      "wrong number of messages: " & $newNumMsgs

waku/waku_archive/archive.nim

@@ -113,14 +113,7 @@ proc handleMessage*(
 
   (await self.driver.put(pubsubTopic, msg, msgDigest, msgHash, msgTimestamp)).isOkOr:
     waku_archive_errors.inc(labelValues = [insertFailure])
-    # Prevent spamming the logs when multiple nodes are connected to the same database.
-    # In that case, the message cannot be inserted but is an expected "insert error"
-    # and therefore we reduce its visibility by having the log in trace level.
-    if "duplicate key value violates unique constraint" in error:
-      trace "failed to insert message", err = error
-    else:
-      debug "failed to insert message", err = error
-
+    debug "failed to insert message", err = error
   let insertDuration = getTime().toUnixFloat() - insertStartTime
   waku_archive_insert_duration_seconds.observe(insertDuration)
 

waku/waku_archive/driver/postgres_driver/postgres_driver.nim

@@ -31,7 +31,7 @@ type PostgresDriver* = ref object of ArchiveDriver
 const InsertRowStmtName = "InsertRow"
 const InsertRowStmtDefinition = # TODO: get the sql queries from a file
   """INSERT INTO messages (id, messageHash, storedAt, contentTopic, payload, pubsubTopic,
-  version, timestamp) VALUES ($1, $2, $3, $4, $5, $6, $7, $8);"""
+  version, timestamp) VALUES ($1, $2, $3, $4, $5, $6, $7, $8) ON CONFLICT DO NOTHING;"""
 
 const SelectNoCursorAscStmtName = "SelectWithoutCursorAsc"
 const SelectNoCursorAscStmtDef =
@@ -679,6 +679,7 @@ proc loopPartitionFactory(
         debug "creating a new partition for the future"
         ## The current used partition is the last one that was created.
         ## Thus, let's create another partition for the future.
+
         (
           await self.addPartition(
             newestPartition.getLastMoment(), PartitionsRangeInterval