diff --git a/benchmarks/orbitdb-documents.js b/benchmarks/orbitdb-documents.js
index 110b44110..9612f07c1 100644
--- a/benchmarks/orbitdb-documents.js
+++ b/benchmarks/orbitdb-documents.js
@@ -1,68 +1,86 @@
 import { createOrbitDB } from '../src/index.js'
-// import { createOrbitDB, MemoryStorage } from '../src/index.js'
-import { rimraf as rmrf } from 'rimraf'
 import createHelia from '../test/utils/create-helia.js'
+// import { MemoryStorage, LevelStorage, LRUStorage } from '../src/storage/index.js'
+import { rimraf as rmrf } from 'rimraf'
 
-import { EventEmitter } from 'events'
-EventEmitter.defaultMaxListeners = 10000
+let db
+let interval
+
+// Metrics
+let totalQueries = 0
+let seconds = 0
+let queriesPerSecond = 0
+let lastTenSeconds = 0
+
+// Settings
+const benchmarkDuration = 20 // seconds
+
+const queryLoop = async () => {
+  const doc = { _id: 'id-' + totalQueries, content: 'hello ' + totalQueries }
+  // await db.put(totalQueries.toString(), { referencesCount: 0 })
+  await db.put(doc)
+  totalQueries++
+  lastTenSeconds++
+  queriesPerSecond++
+  if (interval) {
+    setImmediate(queryLoop)
+  }
+}
 
 ;(async () => {
   console.log('Starting benchmark...')
 
-  const entryCount = 1000
+  console.log('Benchmark duration is ' + benchmarkDuration + ' seconds')
 
-  await rmrf('./ipfs')
   await rmrf('./orbitdb')
 
+  // const identities = await Identities()
+  // const testIdentity = await identities.createIdentity({ id: 'userA' })
+
   const ipfs = await createHelia()
   const orbitdb = await createOrbitDB({ ipfs })
 
-  console.log(`Insert ${entryCount} documents`)
-
+  // MemoryStorage is the default storage for Log but defining them here
+  // in case we want to benchmark different storage modules
   // const entryStorage = await MemoryStorage()
   // const headsStorage = await MemoryStorage()
   // const indexStorage = await MemoryStorage()
-
-  // const db1 = await orbitdb.open('benchmark-documents', { type: 'documents', referencesCount: 16, entryStorage, headsStorage, indexStorage })
-
-  const db1 = await orbitdb.open('benchmark-documents', { type: 'documents' })
-
-  const startTime1 = new Date().getTime()
-
-  for (let i = 0; i < entryCount; i++) {
-    const doc = { _id: i.toString(), message: 'hello ' + i }
-    await db1.put(doc)
-  }
-
-  const endTime1 = new Date().getTime()
-  const duration1 = endTime1 - startTime1
-  const operationsPerSecond1 = Math.floor(entryCount / (duration1 / 1000))
-  const millisecondsPerOp1 = duration1 / entryCount
-  console.log(`Inserting ${entryCount} documents took ${duration1} ms, ${operationsPerSecond1} ops/s, ${millisecondsPerOp1} ms/op`)
-
-  console.log(`Query ${entryCount} documents`)
-  const startTime2 = new Date().getTime()
-
-  const all = []
-  for await (const { key, value } of db1.iterator()) {
-    all.unshift({ key, value })
-  }
-
-  const endTime2 = new Date().getTime()
-  const duration2 = endTime2 - startTime2
-  const operationsPerSecond2 = Math.floor(entryCount / (duration2 / 1000))
-  const millisecondsPerOp2 = duration2 / entryCount
-
-  console.log(`Querying ${all.length} documents took ${duration2} ms, ${operationsPerSecond2} ops/s, ${millisecondsPerOp2} ms/op`)
-
-  await db1.drop()
-  await db1.close()
-
-  await orbitdb.stop()
-  await ipfs.stop()
-
-  await rmrf('./ipfs')
-  await rmrf('./orbitdb')
-
-  process.exit(0)
+  // Test LRUStorage
+  // const entryStorage = await LRUStorage()
+  // const headsStorage = await LRUStorage()
+  // const indexStorage = await LRUStorage()
+  // Test LevelStorage
+  // const entryStorage = await LevelStorage({ path: './logA/entries' })
+  // const headsStorage = await LevelStorage({ path: './orbitdb/benchmark-documents-2/heads', valueEncoding: 'json' })
+  // const headsStorage = await LevelStorage({ path: './orbitdb/benchmark-documents-2/heads' })
+  // const indexStorage = await LevelStorage({ path: './logA/index' })
+
+  // db = await orbitdb.open('benchmark-documents-2', { type: 'documents', entryStorage, headsStorage, indexStorage })
+  db = await orbitdb.open('benchmark-documents-2', { type: 'documents' })
+
+  // Output metrics at 1 second interval
+  interval = setInterval(async () => {
+    seconds++
+    console.log(`${queriesPerSecond} queries per second, ${totalQueries} queries in ${seconds} seconds`)
+    queriesPerSecond = 0
+
+    if (seconds % 10 === 0) {
+      console.log(`--> Average of ${lastTenSeconds / 10} q/s in the last 10 seconds`)
+      if (lastTenSeconds === 0) throw new Error('Problems!')
+      lastTenSeconds = 0
+    }
+
+    if (seconds >= benchmarkDuration) {
+      clearInterval(interval)
+      interval = null
+      process.nextTick(async () => {
+        await db.close()
+        await orbitdb.stop()
+        await rmrf('./orbitdb')
+        process.exit(0)
+      }, 1000)
+    }
+  }, 1000)
+
+  setImmediate(queryLoop)
 })()
diff --git a/src/oplog/heads.js b/src/oplog/heads.js
index cf34b7cb7..4ffbcd0d8 100644
--- a/src/oplog/heads.js
+++ b/src/oplog/heads.js
@@ -9,19 +9,13 @@ import MemoryStorage from '../storage/memory.js'
 
 const DefaultStorage = MemoryStorage
 
-const Heads = async ({ storage, heads }) => {
+const Heads = async ({ storage, heads, entryStorage }) => {
   storage = storage || await DefaultStorage()
 
   const put = async (heads) => {
     heads = findHeads(heads)
-    for (const head of heads) {
-      await storage.put(head.hash, head.bytes)
-    }
-  }
-
-  const set = async (heads) => {
-    await storage.clear()
-    await put(heads)
+    const headHashes = heads.map(e => e.hash)
+    await storage.put('heads', JSON.stringify(headHashes))
   }
 
   const add = async (head) => {
@@ -30,7 +24,7 @@ const Heads = async ({ storage, heads }) => {
       return
     }
     const newHeads = findHeads([...currentHeads, head])
-    await set(newHeads)
+    await put(newHeads)
 
     return newHeads
   }
@@ -38,14 +32,17 @@ const Heads = async ({ storage, heads }) => {
   const remove = async (hash) => {
     const currentHeads = await all()
     const newHeads = currentHeads.filter(e => e.hash !== hash)
-    await set(newHeads)
+    await put(newHeads)
   }
 
   const iterator = async function * () {
-    const it = storage.iterator()
-    for await (const [, bytes] of it) {
-      const head = await Entry.decode(bytes)
-      yield head
+    const headHashes = JSON.parse(await storage.get('heads') || [])
+    for (const hash of headHashes) {
+      const entry = await entryStorage.get(hash)
+      if (entry) {
+        const head = await Entry.decode(entry)
+        yield head
+      }
     }
   }
 
@@ -66,11 +63,32 @@ const Heads = async ({ storage, heads }) => {
   }
 
   // Initialize the heads if given as parameter
-  await put(heads || [])
+  if (heads) {
+    await put(heads)
+  }
+
+  // Migrate from 2.4.3 -> 2.5.0
+  const migrate1 = async () => {
+    const it_ = storage.iterator()
+    const values = []
+    for await (const [hash] of it_) {
+      if (hash !== 'heads') {
+        values.push(hash)
+      }
+    }
+    if (values.length > 0) {
+      console.log('Migrate pre v2.5.0 heads database')
+      console.log('Heads:', values)
+      await storage.clear()
+      await storage.put('heads', JSON.stringify(values))
+    }
+  }
+
+  await migrate1()
 
   return {
     put,
-    set,
+    set: put,
     add,
     remove,
     iterator,
diff --git a/src/oplog/log.js b/src/oplog/log.js
index dd76c8cd6..bfeaf0fe7 100644
--- a/src/oplog/log.js
+++ b/src/oplog/log.js
@@ -79,7 +79,7 @@ const Log = async (identity, { logId, logHeads, access, entryStorage, headsStora
   // Heads storage
   headsStorage = headsStorage || await DefaultStorage()
   // Add heads to the state storage, ie. init the log state
-  const _heads = await Heads({ storage: headsStorage, heads: logHeads })
+  const _heads = await Heads({ storage: headsStorage, heads: logHeads, entryStorage: _entries })
   // Conflict-resolution sorting function
   sortFn = NoZeroes(sortFn || LastWriteWins)
   // Internal queues for processing appends and joins in their call-order
@@ -184,10 +184,10 @@ const Log = async (identity, { logId, logHeads, access, entryStorage, headsStora
         throw new Error(`Could not append entry:\nKey "${identity.hash}" is not allowed to write to the log`)
       }
 
-      // The appended entry is now the latest head
-      await _heads.set([entry])
       // Add entry to the entry storage
       await _entries.put(entry.hash, entry.bytes)
+      // The appended entry is now the latest head
+      await _heads.set([entry])
       // Add entry to the entry index
       await _index.put(entry.hash, true)
       // Return the appended entry
@@ -315,7 +315,7 @@ const Log = async (identity, { logId, logHeads, access, entryStorage, headsStora
       /* 6. Add new entry to entries (for pinning) */
       await _entries.put(entry.hash, entry.bytes)
 
-      /* 6. Add the new entry to heads (=union with current heads) */
+      /* 7. Add the new entry to heads (=union with current heads) */
       await _heads.add(entry)
 
       return true
diff --git a/src/storage/ipfs-block.js b/src/storage/ipfs-block.js
index a1c4acca6..0df62a9c2 100644
--- a/src/storage/ipfs-block.js
+++ b/src/storage/ipfs-block.js
@@ -9,7 +9,7 @@ import { base58btc } from 'multiformats/bases/base58'
 import { TimeoutController } from 'timeout-abort-controller'
 import drain from 'it-drain'
 
-const DefaultTimeout = 30000 // 30 seconds
+const DefaultTimeout = 1000 // 30 seconds
 
 /**
  * Creates an instance of IPFSBlockStorage.
@@ -28,6 +28,8 @@ const DefaultTimeout = 30000 // 30 seconds
 const IPFSBlockStorage = async ({ ipfs, pin, timeout } = {}) => {
   if (!ipfs) throw new Error('An instance of ipfs is required.')
 
+  const signals = new Set()
+
   /**
    * Puts data to an IPFS block.
    * @function
@@ -59,7 +61,9 @@ const IPFSBlockStorage = async ({ ipfs, pin, timeout } = {}) => {
   const get = async (hash) => {
     const cid = CID.parse(hash, base58btc)
     const { signal } = new TimeoutController(timeout || DefaultTimeout)
+    signals.add(signal)
     const block = await ipfs.blockstore.get(cid, { signal })
+    signals.delete(signal)
     if (block) {
       return block
     }
@@ -71,7 +75,12 @@ const IPFSBlockStorage = async ({ ipfs, pin, timeout } = {}) => {
 
   const clear = async () => {}
 
-  const close = async () => {}
+  const close = async () => {
+    for (const s in signals) {
+      s.abort()
+    }
+    signals.clear()
+  }
 
   return {
     put,
diff --git a/src/sync.js b/src/sync.js
index e4005ee65..79255abd7 100644
--- a/src/sync.js
+++ b/src/sync.js
@@ -228,7 +228,7 @@ const Sync = async ({ ipfs, log, events, onSynced, start, timeout }) => {
     }
 
     if (topic === address) {
-      queue.add(task)
+      await queue.add(task)
     }
   }
 
diff --git a/test/database-replication.test.js b/test/database-replication.test.js
index 3d029f449..138ad56ef 100644
--- a/test/database-replication.test.js
+++ b/test/database-replication.test.js
@@ -30,7 +30,7 @@ describe('Database - Replication', function () {
   }
 
   beforeEach(async () => {
-    [ipfs1, ipfs2] = await Promise.all([createHelia(), createHelia()])
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     await copy(testKeysPath, keysPath)
@@ -42,23 +42,21 @@ describe('Database - Replication', function () {
 
   afterEach(async () => {
     if (db1) {
-      await db1.drop()
       await db1.close()
-
       await rimraf('./orbitdb1')
     }
     if (db2) {
-      await db2.drop()
       await db2.close()
-
       await rimraf('./orbitdb2')
     }
 
     if (ipfs1) {
+      await ipfs1.blockstore.child.child.child.close()
       await ipfs1.stop()
     }
 
     if (ipfs2) {
+      await ipfs2.blockstore.child.child.child.close()
       await ipfs2.stop()
     }
 
diff --git a/test/database.test.js b/test/database.test.js
index 5677b5867..082faf7be 100644
--- a/test/database.test.js
+++ b/test/database.test.js
@@ -77,9 +77,9 @@ describe('Database', function () {
 
       await db.close()
 
-      const headsStorage = await LevelStorage({ path: headsPath })
+      const headsStorage = await LevelStorage({ path: headsPath, valueEncoding: 'json' })
 
-      deepStrictEqual((await Entry.decode(await headsStorage.get(hash))).payload, op)
+      deepStrictEqual(await headsStorage.get('heads'), [hash])
 
       await headsStorage.close()
 
@@ -97,9 +97,9 @@ describe('Database', function () {
 
       await db.close()
 
-      const headsStorage = await LevelStorage({ path: headsPath })
+      const headsStorage = await LevelStorage({ path: headsPath, valueEncoding: 'json' })
 
-      deepStrictEqual((await Entry.decode(await headsStorage.get(hash))).payload, op)
+      deepStrictEqual(await headsStorage.get('heads'), [hash])
 
       await headsStorage.close()
 
@@ -113,7 +113,7 @@ describe('Database', function () {
       const op = { op: 'PUT', key: 1, value: 'record 1 on db 1' }
       const hash = await db.addOperation(op)
 
-      deepStrictEqual((await Entry.decode(await headsStorage.get(hash))).payload, op)
+      deepStrictEqual(await headsStorage.get('heads'), [hash])
 
       await db.close()
     })
diff --git a/test/databases/replication/documents.test.js b/test/databases/replication/documents.test.js
index 4c167cd08..aa2577f18 100644
--- a/test/databases/replication/documents.test.js
+++ b/test/databases/replication/documents.test.js
@@ -30,7 +30,7 @@ describe('Documents Database Replication', function () {
   }
 
   before(async () => {
-    [ipfs1, ipfs2] = await Promise.all([createHelia(), createHelia()])
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     await copy(testKeysPath, keysPath)
@@ -42,10 +42,12 @@ describe('Documents Database Replication', function () {
 
   after(async () => {
     if (ipfs1) {
+      await ipfs1.blockstore.child.child.child.close()
       await ipfs1.stop()
     }
 
     if (ipfs2) {
+      await ipfs2.blockstore.child.child.child.close()
       await ipfs2.stop()
     }
 
diff --git a/test/databases/replication/events.test.js b/test/databases/replication/events.test.js
index c956582c3..5962fa631 100644
--- a/test/databases/replication/events.test.js
+++ b/test/databases/replication/events.test.js
@@ -40,7 +40,7 @@ describe('Events Database Replication', function () {
   ]
 
   before(async () => {
-    [ipfs1, ipfs2] = await Promise.all([createHelia(), createHelia()])
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     await copy(testKeysPath, keysPath)
@@ -52,10 +52,12 @@ describe('Events Database Replication', function () {
 
   after(async () => {
     if (ipfs1) {
+      await ipfs1.blockstore.child.child.child.close()
       await ipfs1.stop()
     }
 
     if (ipfs2) {
+      await ipfs2.blockstore.child.child.child.close()
       await ipfs2.stop()
     }
 
diff --git a/test/databases/replication/keyvalue-indexed.test.js b/test/databases/replication/keyvalue-indexed.test.js
index 590bf680f..571863210 100644
--- a/test/databases/replication/keyvalue-indexed.test.js
+++ b/test/databases/replication/keyvalue-indexed.test.js
@@ -29,7 +29,7 @@ describe('KeyValueIndexed Database Replication', function () {
   }
 
   before(async () => {
-    [ipfs1, ipfs2] = await Promise.all([createHelia(), createHelia()])
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     await rimraf(keysPath)
@@ -47,10 +47,12 @@ describe('KeyValueIndexed Database Replication', function () {
 
   after(async () => {
     if (ipfs1) {
+      await ipfs1.blockstore.child.child.child.close()
       await ipfs1.stop()
     }
 
     if (ipfs2) {
+      await ipfs2.blockstore.child.child.child.close()
       await ipfs2.stop()
     }
 
diff --git a/test/databases/replication/keyvalue.test.js b/test/databases/replication/keyvalue.test.js
index b12114d43..2bbce2bb0 100644
--- a/test/databases/replication/keyvalue.test.js
+++ b/test/databases/replication/keyvalue.test.js
@@ -29,7 +29,7 @@ describe('KeyValue Database Replication', function () {
   }
 
   before(async () => {
-    [ipfs1, ipfs2] = await Promise.all([createHelia(), createHelia()])
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     await copy(testKeysPath, keysPath)
@@ -41,10 +41,12 @@ describe('KeyValue Database Replication', function () {
 
   after(async () => {
     if (ipfs1) {
+      await ipfs1.blockstore.child.child.child.close()
       await ipfs1.stop()
     }
 
     if (ipfs2) {
+      await ipfs2.blockstore.child.child.child.close()
       await ipfs2.stop()
     }
 
diff --git a/test/fixtures/pre-2.5.0/ipfs/blocks/000003.log b/test/fixtures/pre-2.5.0/ipfs/blocks/000003.log
new file mode 100644
index 000000000..57550c8b8
Binary files /dev/null and b/test/fixtures/pre-2.5.0/ipfs/blocks/000003.log differ
diff --git a/test/fixtures/pre-2.5.0/ipfs/blocks/CURRENT b/test/fixtures/pre-2.5.0/ipfs/blocks/CURRENT
new file mode 100644
index 000000000..1a8485221
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/ipfs/blocks/CURRENT
@@ -0,0 +1 @@
+MANIFEST-000002
diff --git a/test/fixtures/pre-2.5.0/ipfs/blocks/LOCK b/test/fixtures/pre-2.5.0/ipfs/blocks/LOCK
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/pre-2.5.0/ipfs/blocks/LOG b/test/fixtures/pre-2.5.0/ipfs/blocks/LOG
new file mode 100644
index 000000000..0b0087e7c
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/ipfs/blocks/LOG
@@ -0,0 +1 @@
+2024/11/29-11:58:49.407658 172883000 Delete type=3 #1
diff --git a/test/fixtures/pre-2.5.0/ipfs/blocks/MANIFEST-000002 b/test/fixtures/pre-2.5.0/ipfs/blocks/MANIFEST-000002
new file mode 100644
index 000000000..bbbc58568
Binary files /dev/null and b/test/fixtures/pre-2.5.0/ipfs/blocks/MANIFEST-000002 differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/keystore/000003.log b/test/fixtures/pre-2.5.0/orbitdb/keystore/000003.log
new file mode 100644
index 000000000..5fb117575
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/keystore/000003.log differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/keystore/CURRENT b/test/fixtures/pre-2.5.0/orbitdb/keystore/CURRENT
new file mode 100644
index 000000000..1a8485221
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/keystore/CURRENT
@@ -0,0 +1 @@
+MANIFEST-000002
diff --git a/test/fixtures/pre-2.5.0/orbitdb/keystore/LOCK b/test/fixtures/pre-2.5.0/orbitdb/keystore/LOCK
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/pre-2.5.0/orbitdb/keystore/LOG b/test/fixtures/pre-2.5.0/orbitdb/keystore/LOG
new file mode 100644
index 000000000..ea5ff6891
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/keystore/LOG
@@ -0,0 +1 @@
+2024/11/29-11:58:49.433589 172883000 Delete type=3 #1
diff --git a/test/fixtures/pre-2.5.0/orbitdb/keystore/MANIFEST-000002 b/test/fixtures/pre-2.5.0/orbitdb/keystore/MANIFEST-000002
new file mode 100644
index 000000000..bbbc58568
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/keystore/MANIFEST-000002 differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/000003.log b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/000003.log
new file mode 100644
index 000000000..7fc21a6df
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/000003.log differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/CURRENT b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/CURRENT
new file mode 100644
index 000000000..1a8485221
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/CURRENT
@@ -0,0 +1 @@
+MANIFEST-000002
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/LOCK b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/LOCK
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/LOG b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/LOG
new file mode 100644
index 000000000..25e0ef731
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/LOG
@@ -0,0 +1 @@
+2024/11/29-11:58:49.466751 172077000 Delete type=3 #1
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/MANIFEST-000002 b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/MANIFEST-000002
new file mode 100644
index 000000000..bbbc58568
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_heads/MANIFEST-000002 differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/000003.log b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/000003.log
new file mode 100644
index 000000000..9ef96f5ad
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/000003.log differ
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/CURRENT b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/CURRENT
new file mode 100644
index 000000000..1a8485221
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/CURRENT
@@ -0,0 +1 @@
+MANIFEST-000002
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/LOCK b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/LOCK
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/LOG b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/LOG
new file mode 100644
index 000000000..1587c733a
--- /dev/null
+++ b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/LOG
@@ -0,0 +1 @@
+2024/11/29-11:58:49.467617 17389b000 Delete type=3 #1
diff --git a/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/MANIFEST-000002 b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/MANIFEST-000002
new file mode 100644
index 000000000..bbbc58568
Binary files /dev/null and b/test/fixtures/pre-2.5.0/orbitdb/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES/log/_index/MANIFEST-000002 differ
diff --git a/test/heads-migration.test.js b/test/heads-migration.test.js
new file mode 100644
index 000000000..210c2a8e3
--- /dev/null
+++ b/test/heads-migration.test.js
@@ -0,0 +1,52 @@
+import { deepStrictEqual } from 'assert'
+import { copy } from 'fs-extra'
+import { rimraf } from 'rimraf'
+import { createOrbitDB } from '../src/index.js'
+import createHelia from './utils/create-helia.js'
+
+describe('Migrations', function () {
+  this.timeout(10000)
+
+  let ipfs
+  let orbitdb
+
+  const fixturesPath = './test/fixtures/pre-2.5.0'
+  const testDir = './test-heads-migration'
+
+  before(async () => {
+    await copy(fixturesPath, testDir)
+    ipfs = await createHelia({ directory: `${testDir}/ipfs` })
+    orbitdb = await createOrbitDB({ ipfs, id: 'user1', directory: `${testDir}/orbitdb` })
+  })
+
+  after(async () => {
+    await orbitdb.stop()
+    await ipfs.blockstore.child.child.child.close()
+    await ipfs.stop()
+    await rimraf(testDir)
+  })
+
+  it.only('migrates the heads database from pre 2.5.0 to 2.5.0 format', async () => {
+    const db = await orbitdb.open('/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES')
+
+    const res = []
+
+    for await (const event of db.iterator()) {
+      res.unshift(event)
+    }
+
+    deepStrictEqual(res.length, 129)
+  })
+
+  it.only('can read the database after migration to 2.5.0 format', async () => {
+    const db = await orbitdb.open('/orbitdb/zdpuAoE5P3f5zsPGkNDVgK4XF61oyE5c5JY6Yz5d74oWFCYES')
+
+    const res = []
+
+    for await (const event of db.iterator()) {
+      res.unshift(event)
+    }
+
+    deepStrictEqual(res.length, 129)
+  })
+})
diff --git a/test/oplog/join.test.js b/test/oplog/join.test.js
index 7c313c9e7..be4a24242 100644
--- a/test/oplog/join.test.js
+++ b/test/oplog/join.test.js
@@ -760,7 +760,7 @@ describe('Log - Join', async function () {
 
       await log1.storage.merge(log0.storage)
 
-      await headsStorage1.put(e0.hash, e0.bytes)
+      await headsStorage1.put('heads', [e0.hash])
 
       await log1.append('hello1')
       await log1.append('hello2')
diff --git a/test/orbitdb-replication.test.js b/test/orbitdb-replication.test.js
index 916854a87..a9983a151 100644
--- a/test/orbitdb-replication.test.js
+++ b/test/orbitdb-replication.test.js
@@ -14,8 +14,7 @@ describe('Replicating databases', function () {
   let orbitdb1, orbitdb2
 
   before(async () => {
-    ipfs1 = await createHelia({ directory: './ipfs1' })
-    ipfs2 = await createHelia({ directory: './ipfs2' })
+    [ipfs1, ipfs2] = await Promise.all([createHelia({ directory: './ipfs1' }), createHelia({ directory: './ipfs2' })])
     await connectPeers(ipfs1, ipfs2)
 
     orbitdb1 = await createOrbitDB({ ipfs: ipfs1, id: 'user1', directory: './orbitdb1' })
@@ -138,10 +137,6 @@ describe('Replicating databases', function () {
 
       await orbitdb1.stop()
       await orbitdb2.stop()
-      // TODO: Strange issue with ClassicLevel. Causes subsequent Helia
-      // instantiations to error with db closed. Explicitly closing the
-      // nested ClassicLevel db seems to resolve the issue. Requires further
-      // investigation.
       await ipfs1.blockstore.child.child.child.close()
       await ipfs2.blockstore.child.child.child.close()
       await ipfs1.stop()
@@ -153,10 +148,8 @@ describe('Replicating databases', function () {
       await connectPeers(ipfs1, ipfs2)
 
       orbitdb1 = await createOrbitDB({ ipfs: ipfs1, id: 'user1', directory: './orbitdb1' })
-      orbitdb2 = await createOrbitDB({ ipfs: ipfs2, id: 'user2', directory: './orbitdb2' })
 
       db1 = await orbitdb1.open('helloworld', { referencesCount: 0 })
-      db2 = await orbitdb2.open(db1.address)
 
       console.time('query 2')
       const eventsFromDb1 = []
@@ -180,6 +173,8 @@ describe('Replicating databases', function () {
         replicated = true
       }
 
+      orbitdb2 = await createOrbitDB({ ipfs: ipfs2, id: 'user2', directory: './orbitdb2' })
+
       const db2 = await orbitdb2.open(db1.address)
 
       db2.events.on('join', onJoin)