define a nostr.Kind type for event kinds, make adjustments everywhere and fix some horrible bugs with mmm, lmdb and badger querying and deleting.

eventstore/codec/betterbinary/accessors.go

@@ -0,0 +1,23 @@
+package betterbinary
+
+import (
+	"encoding/binary"
+
+	"fiatjaf.com/nostr"
+)
+
+func GetKind(evtb []byte) nostr.Kind {
+	return nostr.Kind(binary.LittleEndian.Uint16(evtb[1:3]))
+}
+
+func GetID(evtb []byte) nostr.ID {
+	return nostr.ID(evtb[7:39])
+}
+
+func GetPubKey(evtb []byte) nostr.PubKey {
+	return nostr.PubKey(evtb[39:71])
+}
+
+func GetCreatedAt(evtb []byte) nostr.Timestamp {
+	return nostr.Timestamp(binary.LittleEndian.Uint32(evtb[3:7]))
+}