feat: Improve Mycelium-based data synchronization

- Refactor data synchronization logic to use Mycelium messages for
  efficient updates between master and worker nodes.  This removes
  the previous inefficient polling method and simplifies the code.
- Update the slave node to receive and apply updates from the
  master, improving synchronization efficiency and robustness.
- Change the default slave port to 9000.
- Rename `db` variable to `worker` for clarity.

examples/data/deduped_mycelium_slave.vsh

@@ -9,19 +9,10 @@ import os
 import encoding.base64
 import json
 
-// NOTE: Before running this script, ensure that the mycelium binary is installed and in the PATH
+const slave_port = 9000
-
-const slave_port = 9001
 const master_public_key = '89c2eeb24bcdfaaac78c0023a166d88f760c097c1a57748770e432ba10757179'
 const master_address = '458:90d4:a3ef:b285:6d32:a22d:9e73:697f'
 
-// Struct to hold data for syncing
-struct SyncData {
-	id    u32
-	data  string
-	topic string = 'db_sync'
-}
-
 mycelium.delete()!
 
 // Initialize mycelium clients
@@ -35,7 +26,7 @@ slave_inspect := mycelium.inspect(key_file_path: '/tmp/mycelium_server1/priv_key
 println('Server 2 (slave Node) public key: ${slave_inspect.public_key}')
 
 // Initialize ourdb instances
-mut db := ourdb.new(
+mut worker := ourdb.new(
 	record_nr_max:   16777216 - 1
 	record_size_max: 1024
 	path:            '/tmp/ourdb1'
@@ -43,7 +34,7 @@ mut db := ourdb.new(
 )!
 
 defer {
-	db.destroy() or { panic('failed to destroy db1: ${err}') }
+	worker.destroy() or { panic('failed to destroy db1: ${err}') }
 }
 
 // Receive messages
@@ -52,24 +43,5 @@ received := slave.receive_msg(wait: true, peek: false, topic: 'db_sync')!
 println('Received message from: ${received.src_pk}')
 println('Message payload: ${base64.decode_str(received.payload)}')
 
-// Send the last inserted record id to the master
+payload := received.payload
-// data := 'Test data for sync - ' + time.now().str()
+worker.sync_updates(payload.bytes()) or { error('Failed to sync updates to worker due to: ${err}') }
-id := db.get_last_index()!
-println('Last inserted record id: ${id}')
-
-// Send sync message to slave
-println('\nSending sync message to slave...')
-msg := slave.send_msg(
-	public_key: master_public_key
-	payload:    'last_inserted_record_id,${id}'
-	topic:      'db_sync'
-)!
-
-// slave.reply_msg(
-// 	id:         received.id
-// 	public_key: received.src_pk
-// 	payload:    'Got your message!'
-// 	topic:      'db_sync'
-// )!
-
-// println('Message sent to master with ID: ${msg.id}')

lib/data/ourdb/mycelium_streamer.v

@@ -7,6 +7,7 @@ pub mut:
 	master           &OurDB            @[skip; str: skip]
 	workers          map[string]&OurDB @[skip; str: skip] // key is mycelium public key, value is ourdb
 	incremental_mode bool = true // default is true
+	mycelium_client  &mycelium.Mycelium
 }
 
 pub struct NewStreamerArgs {
@@ -35,7 +36,9 @@ pub fn new_streamer(args NewStreamerArgs) !MyceliumStreamer {
 		master:           &db
 		workers:          {}
 		incremental_mode: args.incremental_mode
+		mycelium_client:  &mycelium.Mycelium{}
 	}
+	s.mycelium_client = mycelium.get()!
 	return s
 }
 
@@ -52,13 +55,15 @@ pub fn (mut s MyceliumStreamer) write(record MyceliumRecordArgs) !u32 {
 	}
 
 	// Get updates from the beginning (id 0) to ensure complete sync
-	data := s.master.push_updates(0) or { return error('Failed to push updates due to: ${err}') }
+	data := s.master.push_updates(id) or { return error('Failed to push updates due to: ${err}') }
 
 	// Broadcast to all workers
-	for _, mut worker in s.workers {
+	for worker_key, mut _ in s.workers {
-		worker.sync_updates(data) or {
+		s.mycelium_client.send_msg(
-			return error('Failed to sync updates to worker due to: ${err}')
+			public_key: worker_key // destination public key
-		}
+			payload:    data.str() // message payload
+			topic:      'sync_db' // optional topic
+		)!
 	}
 	return id
 }