diff --git a/docs/development/OpenNexus生产化实施进度-2026-09-08.md b/docs/development/OpenNexus生产化实施进度-2026-09-08.md
index 9e00bea..5f151a8 100644
--- a/docs/development/OpenNexus生产化实施进度-2026-09-08.md
+++ b/docs/development/OpenNexus生产化实施进度-2026-09-08.md
@@ -51,3 +51,11 @@
 | 发布 | 统一逐 ID 验收 runner；MSVC 签名安装更新包、SBOM/依赖扫描；两台独立设备 E-01–05 |
 
 Core 的独立数据目录目前不等于已授权 Vault。Python 旧笔记写入口在 desktop 模式明确拒绝，不能据此宣称 AI 笔记工作流完成。Host `sync/extensions` 能力仍为 false。缺少实机与签名环境不构成其余普通工程尚未完成的理由。
+
+
+## 增量：可恢复的同步冲突解决
+
+- Workspace schema 5 在修改文件前持久保存解决选择和三个操作 ID；保留本地、采用远端、另存副本均通过现有文件 journal 提交，再归档旧上传队列。启动下一轮 push/pull 时恢复未完成的解决事务。
+- 旧任务进入 conflict/archived 后拒绝上传或提交回执更新；未解决文件暂停发送，其他文件仍可推进。同路径删除后重建使用新的远端 file_id，原删除身份保留为 tombstone。
+- 两个独立 Rust Workspace/会话通过真实本地 Sync HTTP 服务验证三种选择最终收敛及副本独立身份。新增三项测试覆盖文件已提交但解决记录未提交时重启、删除对编辑、远端删除后重建与恢复旧身份。
+- Rust desktop 全目标 42 项通过，Clippy `-D warnings` 通过。测试服务使用隔离 SQLite/文件对象存储；尚不代表 PostgreSQL/MinIO 部署验收。不同文件身份占用同一路径仍返回明确的需改名错误，解决界面和 Host 会话接入继续实现中。
diff --git a/frontend/src-tauri/src/lib.rs b/frontend/src-tauri/src/lib.rs
index 0ce43d4..0c631e8 100644
--- a/frontend/src-tauri/src/lib.rs
+++ b/frontend/src-tauri/src/lib.rs
@@ -11,6 +11,7 @@ pub mod session_lock;
 #[cfg(feature = "desktop")]
 pub mod sync_client;
 pub mod sync_inbox;
+pub mod sync_resolution;
 pub mod sync_state;
 pub mod workspace;
 pub mod workspace_broker;
diff --git a/frontend/src-tauri/src/sync_client.rs b/frontend/src-tauri/src/sync_client.rs
index b01377e..2609188 100644
--- a/frontend/src-tauri/src/sync_client.rs
+++ b/frontend/src-tauri/src/sync_client.rs
@@ -236,6 +236,7 @@ impl SyncClient {
         }
         identifier(&binding.remote_vault)?;
         let job = workspace.access(|ws| {
+            ws.sync_resume_resolutions(&binding.id)?;
             ws.sync_capture(&binding.id)?;
             ws.sync_next(&binding.id)
         })?;
@@ -272,6 +273,7 @@ impl SyncClient {
         }
         identifier(&binding.remote_vault)?;
         workspace.access(|ws| {
+            ws.sync_resume_resolutions(&binding.id)?;
             while ws.sync_apply_pending(&binding.id)? {}
             Ok(())
         })?;
diff --git a/frontend/src-tauri/src/sync_inbox.rs b/frontend/src-tauri/src/sync_inbox.rs
index 7ee9136..2983384 100644
--- a/frontend/src-tauri/src/sync_inbox.rs
+++ b/frontend/src-tauri/src/sync_inbox.rs
@@ -224,7 +224,7 @@ impl Workspace {
                 remote
             ],
         )?;
-        tx.execute("UPDATE sync_jobs SET state='conflict' WHERE binding=?1 AND file_id=?2 AND state!='acked'", params![binding,revision.file_id])?;
+        tx.execute("UPDATE sync_jobs SET state='conflict' WHERE binding=?1 AND file_id=?2 AND state NOT IN ('acked','archived')", params![binding,revision.file_id])?;
         tx.commit()?;
         self.sync_finish(binding, revision, "conflict")
     }
@@ -239,7 +239,8 @@ impl Workspace {
         let own: Option<Job> = self.db.query_row("SELECT binding,operation_id,file_id,path,hash,size,operation,state,base_revision,upload_id FROM sync_jobs WHERE binding=?1 AND operation_id=?2", params![binding,revision.operation_id], |r| {
             Ok(Job { binding:r.get(0)?,operation_id:r.get(1)?,file_id:r.get(2)?,path:r.get(3)?,hash:r.get(4)?,size:r.get(5)?,operation:r.get(6)?,state:r.get(7)?,base_revision:r.get(8)?,upload_id:r.get(9)? })
         }).optional()?;
-        if let Some(job) = own {
+        if let Some(job) = own.filter(|job| !matches!(job.state.as_str(), "archived" | "conflict"))
+        {
             self.sync_ack(
                 &job,
                 &serde_json::to_value(&revision)
diff --git a/frontend/src-tauri/src/sync_resolution.rs b/frontend/src-tauri/src/sync_resolution.rs
new file mode 100644
index 0000000..5b7a60b
--- /dev/null
+++ b/frontend/src-tauri/src/sync_resolution.rs
@@ -0,0 +1,420 @@
+//! User decisions are durable before changing files; journal IDs make restart replay safe.
+use crate::{
+    sync_inbox::RemoteRevision,
+    workspace::{hash, Entry, HostError, Result, Workspace},
+};
+use rusqlite::{params, OptionalExtension};
+use std::fs;
+use uuid::Uuid;
+
+impl Workspace {
+    pub fn sync_resolve(
+        &mut self,
+        binding: &str,
+        sequence: i64,
+        choice: &str,
+        destination: &str,
+        expected: &str,
+    ) -> Result<()> {
+        self.check_binding(binding)?;
+        if !matches!(choice, "local" | "remote" | "copy") {
+            return Err(HostError::new("SYNC_RESOLUTION_INVALID"));
+        }
+        let existing: Option<(String,String,String)> = self.db.query_row("SELECT choice,destination,expected FROM sync_resolutions WHERE binding=?1 AND sequence=?2",params![binding,sequence],|r| Ok((r.get(0)?,r.get(1)?,r.get(2)?))).optional()?;
+        if let Some(previous) = existing {
+            if previous
+                != (
+                    choice.to_owned(),
+                    destination.to_owned(),
+                    expected.to_owned(),
+                )
+            {
+                return Err(HostError::new("SYNC_RESOLUTION_CHANGED"));
+            }
+        } else {
+            let (path,remote): (String,String) = self.db.query_row("SELECT local_path,remote FROM sync_conflicts WHERE binding=?1 AND sequence=?2 AND state='open'",params![binding,sequence],|r| Ok((r.get(0)?,r.get(1)?)))?;
+            let revision: RemoteRevision = serde_json::from_str(&remote)
+                .map_err(|_| HostError::new("SYNC_RESPONSE_INVALID"))?;
+            let source = self.resolve(&path)?;
+            let current = if source.is_file() {
+                self.sync_store_bytes(&fs::read(source)?)?
+            } else {
+                String::new()
+            };
+            if current != expected {
+                return Err(HostError::new("REVISION_CONFLICT"));
+            }
+            if !current.is_empty() && self.path_for_id(&revision.file_id).is_err() {
+                return Err(HostError::new("SYNC_CONFLICT_REQUIRES_RENAME"));
+            }
+            if choice == "copy" {
+                if current.is_empty() || self.resolve(destination)?.exists() {
+                    return Err(HostError::new("PATH_CONFLICT"));
+                }
+            } else if !destination.is_empty() {
+                return Err(HostError::new("SYNC_RESOLUTION_INVALID"));
+            }
+            self.db.execute(
+                "INSERT INTO sync_resolutions VALUES (?1,?2,?3,?4,?5,?6,?7,?8,'pending')",
+                params![
+                    binding,
+                    sequence,
+                    choice,
+                    destination,
+                    expected,
+                    Uuid::new_v4().to_string(),
+                    Uuid::new_v4().to_string(),
+                    Uuid::new_v4().to_string()
+                ],
+            )?;
+        }
+        self.sync_apply_resolution(binding, sequence)
+    }
+    pub fn sync_resume_resolutions(&mut self, binding: &str) -> Result<()> {
+        self.check_binding(binding)?;
+        let pending = {
+            let mut statement=self.db.prepare("SELECT sequence FROM sync_resolutions WHERE binding=?1 AND state='pending' ORDER BY sequence")?;
+            let values = statement
+                .query_map([binding], |r| r.get::<_, i64>(0))?
+                .collect::<std::result::Result<Vec<_>, _>>()?;
+            values
+        };
+        for sequence in pending {
+            self.sync_apply_resolution(binding, sequence)?;
+        }
+        Ok(())
+    }
+    fn sync_apply_resolution(&mut self, binding: &str, sequence: i64) -> Result<()> {
+        self.check_binding(binding)?;
+        let (choice,destination,expected,operation,rename,copy,state): (String,String,String,String,String,String,String) = self.db.query_row("SELECT choice,destination,expected,operation_id,rename_id,copy_id,state FROM sync_resolutions WHERE binding=?1 AND sequence=?2",params![binding,sequence],|r| Ok((r.get(0)?,r.get(1)?,r.get(2)?,r.get(3)?,r.get(4)?,r.get(5)?,r.get(6)?)))?;
+        if state == "completed" {
+            return Ok(());
+        }
+        let (stored_path, remote): (String, String) = self.db.query_row(
+            "SELECT local_path,remote FROM sync_conflicts WHERE binding=?1 AND sequence=?2",
+            params![binding, sequence],
+            |r| Ok((r.get(0)?, r.get(1)?)),
+        )?;
+        let revision: RemoteRevision =
+            serde_json::from_str(&remote).map_err(|_| HostError::new("SYNC_RESPONSE_INVALID"))?;
+        let head: i64 = self.db.query_row(
+            "SELECT revision FROM sync_heads WHERE binding=?1 AND file_id=?2",
+            params![binding, revision.file_id],
+            |r| r.get(0),
+        )?;
+        if head != sequence {
+            return Err(HostError::new("SYNC_CONFLICT_CHANGED"));
+        }
+        let path = self.path_for_id(&revision.file_id).unwrap_or(stored_path);
+        if !self
+            .operation(&operation)?
+            .is_some_and(|value| value["state"] == "committed")
+        {
+            let source = self.resolve(&path)?;
+            let current = if source.is_file() {
+                hash(&fs::read(source)?)
+            } else {
+                String::new()
+            };
+            if current != expected {
+                return Err(HostError::new("REVISION_CONFLICT"));
+            }
+            if choice == "copy" {
+                let content = fs::read(self.sync_spool(&expected)?)?;
+                self.write_operation(&destination, "", &content, "local", &copy)?;
+            }
+            if choice == "local" {
+                if current.is_empty() {
+                    self.sync_delete_intent(&revision, &operation)?;
+                } else {
+                    let content = fs::read(self.sync_spool(&expected)?)?;
+                    self.write_operation(&path, &expected, &content, "local", &operation)?;
+                }
+            } else if revision.operation == "delete" {
+                if !current.is_empty() {
+                    self.mutate_with_origin("delete", &path, "", &current, &operation, "remote")?;
+                }
+            } else {
+                if path != revision.path && !current.is_empty() {
+                    self.mutate_with_origin(
+                        "rename",
+                        &path,
+                        &revision.path,
+                        &current,
+                        &rename,
+                        "remote",
+                    )?;
+                }
+                let content = fs::read(
+                    self.sync_spool(
+                        revision
+                            .hash
+                            .as_deref()
+                            .ok_or_else(|| HostError::new("SYNC_RESPONSE_INVALID"))?,
+                    )?,
+                )?;
+                self.write_with_identity(
+                    &revision.path,
+                    &current,
+                    &content,
+                    "remote",
+                    &operation,
+                    Some(&revision.file_id),
+                )?;
+            }
+        }
+        let tx = self.db.transaction()?;
+        tx.execute("UPDATE outbox SET state='archived' WHERE file_id=?1 AND state IN ('pending','queued') AND operation_id!=?2",params![revision.file_id,operation])?;
+        tx.execute("UPDATE sync_jobs SET state='archived' WHERE binding=?1 AND file_id=?2 AND state!='acked' AND operation_id!=?3",params![binding,revision.file_id,operation])?;
+        tx.execute(
+            "UPDATE sync_conflicts SET state='resolved' WHERE binding=?1 AND sequence=?2",
+            params![binding, sequence],
+        )?;
+        tx.execute(
+            "UPDATE sync_resolutions SET state='completed' WHERE binding=?1 AND sequence=?2",
+            params![binding, sequence],
+        )?;
+        tx.commit()?;
+        Ok(())
+    }
+    fn sync_delete_intent(&mut self, revision: &RemoteRevision, operation: &str) -> Result<()> {
+        let tx = self.db.transaction()?;
+        tx.execute(
+            "UPDATE files SET deleted=1,revision=revision+1 WHERE id=?1",
+            [&revision.file_id],
+        )?;
+        let entry: Entry = tx.query_row(
+            "SELECT id,path,hash,revision FROM files WHERE id=?1",
+            [&revision.file_id],
+            |r| {
+                Ok(Entry {
+                    file_id: r.get(0)?,
+                    path: r.get(1)?,
+                    hash: r.get(2)?,
+                    revision: r.get(3)?,
+                    deleted: true,
+                    is_folder: false,
+                })
+            },
+        )?;
+        tx.execute(
+            "INSERT INTO outbox VALUES (?1,?2,?3,?4,'','delete',X'','pending')",
+            params![operation, entry.file_id, entry.revision, revision.path],
+        )?;
+        let encoded =
+            serde_json::to_string(&entry).map_err(|_| HostError::new("DATABASE_ERROR"))?;
+        tx.execute(
+            "INSERT INTO operations VALUES (?1,?2,'committed',?3)",
+            params![
+                operation,
+                hash(format!("sync-delete:{}:{}", revision.file_id, revision.sequence).as_bytes()),
+                encoded
+            ],
+        )?;
+        tx.commit()?;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    fn receive(ws: &mut Workspace, binding: &str, revision: &RemoteRevision) {
+        ws.sync_set_boundary(binding, revision.sequence).unwrap();
+        ws.sync_stage(binding, revision).unwrap();
+        ws.sync_apply_pending(binding).unwrap();
+    }
+    #[test]
+    fn decisions_recover_after_file_commit_without_duplicate_outbox() {
+        for choice in ["local", "remote", "copy"] {
+            let root = tempfile::tempdir().unwrap();
+            let mut ws = Workspace::open(root.path()).unwrap();
+            let binding = ws
+                .sync_bind_download("https://sync.example", "remote-vault", "account")
+                .unwrap();
+            let file_id = Uuid::new_v4().to_string();
+            let mut remote = RemoteRevision {
+                vault_id: "remote-vault".into(),
+                sequence: 1,
+                file_id,
+                base_revision: 0,
+                path: "a.md".into(),
+                operation: "put".into(),
+                hash: Some(ws.sync_store_bytes(b"one").unwrap()),
+                size: 3,
+                operation_id: Uuid::new_v4().to_string(),
+            };
+            receive(&mut ws, &binding.id, &remote);
+            let local = ws.write("a.md", &hash(b"one"), b"local", "local").unwrap();
+            ws.sync_capture(&binding.id).unwrap();
+            let stale = ws.sync_next(&binding.id).unwrap().unwrap();
+            remote.sequence = 2;
+            remote.base_revision = 1;
+            remote.hash = Some(ws.sync_store_bytes(b"two").unwrap());
+            remote.operation_id = Uuid::new_v4().to_string();
+            receive(&mut ws, &binding.id, &remote);
+            assert!(ws.sync_next(&binding.id).unwrap().is_none());
+            assert_eq!(
+                ws.sync_commit_payload(&stale).unwrap_err().code,
+                "SYNC_OPERATION_SUPERSEDED"
+            );
+            let operation = Uuid::new_v4().to_string();
+            let copy = Uuid::new_v4().to_string();
+            ws.db
+                .execute(
+                    "INSERT INTO sync_resolutions VALUES (?1,2,?2,?3,?4,?5,?6,?7,'pending')",
+                    params![
+                        binding.id,
+                        choice,
+                        if choice == "copy" { "copy.md" } else { "" },
+                        local.hash,
+                        operation,
+                        Uuid::new_v4().to_string(),
+                        copy
+                    ],
+                )
+                .unwrap();
+            // Simulate a crash after the filesystem journal commits but before the resolution transaction.
+            if choice == "copy" {
+                ws.write_operation("copy.md", "", b"local", "local", &copy)
+                    .unwrap();
+            }
+            if choice == "local" {
+                ws.write_operation("a.md", &local.hash, b"local", "local", &operation)
+                    .unwrap();
+            } else {
+                ws.write_with_identity(
+                    "a.md",
+                    &local.hash,
+                    b"two",
+                    "remote",
+                    &operation,
+                    Some(&remote.file_id),
+                )
+                .unwrap();
+            }
+            drop(ws);
+            let mut ws = Workspace::open(root.path()).unwrap();
+            ws.sync_resume_resolutions(&binding.id).unwrap();
+            ws.sync_resume_resolutions(&binding.id).unwrap();
+            assert!(ws.sync_conflicts(&binding.id).unwrap().is_empty());
+            assert_eq!(
+                ws.read("a.md").unwrap().content,
+                if choice == "local" { "local" } else { "two" }
+            );
+            assert_eq!(
+                ws.pending_count().unwrap(),
+                if choice == "remote" { 0 } else { 1 }
+            );
+            if choice == "copy" {
+                assert_eq!(ws.read("copy.md").unwrap().content, "local");
+            }
+            assert_eq!(
+                ws.sync_commit_payload(&stale).unwrap_err().code,
+                "SYNC_OPERATION_SUPERSEDED"
+            );
+        }
+    }
+    #[test]
+    fn deletion_resolution_and_remote_recreation_preserve_identity() {
+        for choice in ["local", "remote", "copy"] {
+            let root = tempfile::tempdir().unwrap();
+            let mut ws = Workspace::open(root.path()).unwrap();
+            let binding = ws
+                .sync_bind_download("https://sync.example", "remote-vault", "account")
+                .unwrap();
+            let mut remote = RemoteRevision {
+                vault_id: "remote-vault".into(),
+                sequence: 1,
+                file_id: Uuid::new_v4().to_string(),
+                base_revision: 0,
+                path: "a.md".into(),
+                operation: "put".into(),
+                hash: Some(ws.sync_store_bytes(b"one").unwrap()),
+                size: 3,
+                operation_id: Uuid::new_v4().to_string(),
+            };
+            receive(&mut ws, &binding.id, &remote);
+            let original = remote.file_id.clone();
+            let local = ws.write("a.md", &hash(b"one"), b"local", "local").unwrap();
+            remote.sequence = 2;
+            remote.base_revision = 1;
+            remote.operation = "delete".into();
+            remote.hash = None;
+            remote.size = 0;
+            remote.operation_id = Uuid::new_v4().to_string();
+            receive(&mut ws, &binding.id, &remote);
+            ws.sync_resolve(
+                &binding.id,
+                2,
+                choice,
+                if choice == "copy" { "copy.md" } else { "" },
+                &local.hash,
+            )
+            .unwrap();
+            if choice == "local" {
+                assert_eq!(ws.read("a.md").unwrap().content, "local");
+                continue;
+            }
+            assert!(!root.path().join("a.md").exists());
+            remote.sequence = 3;
+            remote.base_revision = 0;
+            remote.file_id = Uuid::new_v4().to_string();
+            remote.operation = "put".into();
+            remote.hash = Some(ws.sync_store_bytes(b"new").unwrap());
+            remote.size = 3;
+            remote.operation_id = Uuid::new_v4().to_string();
+            receive(&mut ws, &binding.id, &remote);
+            assert_eq!(ws.read("a.md").unwrap().entry.file_id, remote.file_id);
+            // A tombstoned identity can reappear at another free path.
+            remote.sequence = 4;
+            remote.base_revision = 2;
+            remote.file_id = original.clone();
+            remote.path = "restored.md".into();
+            remote.operation_id = Uuid::new_v4().to_string();
+            receive(&mut ws, &binding.id, &remote);
+            assert_eq!(ws.read("restored.md").unwrap().entry.file_id, original);
+            assert_eq!(ws.read("a.md").unwrap().content, "new");
+        }
+    }
+    #[test]
+    fn keep_local_deletion_queues_new_delete_on_remote_head() {
+        let root = tempfile::tempdir().unwrap();
+        let mut ws = Workspace::open(root.path()).unwrap();
+        let binding = ws
+            .sync_bind_download("https://sync.example", "remote-vault", "account")
+            .unwrap();
+        let mut remote = RemoteRevision {
+            vault_id: "remote-vault".into(),
+            sequence: 1,
+            file_id: Uuid::new_v4().to_string(),
+            base_revision: 0,
+            path: "a.md".into(),
+            operation: "put".into(),
+            hash: Some(ws.sync_store_bytes(b"one").unwrap()),
+            size: 3,
+            operation_id: Uuid::new_v4().to_string(),
+        };
+        receive(&mut ws, &binding.id, &remote);
+        ws.mutate_operation(
+            "delete",
+            "a.md",
+            "",
+            &hash(b"one"),
+            &Uuid::new_v4().to_string(),
+        )
+        .unwrap();
+        remote.sequence = 2;
+        remote.base_revision = 1;
+        remote.hash = Some(ws.sync_store_bytes(b"two").unwrap());
+        remote.operation_id = Uuid::new_v4().to_string();
+        receive(&mut ws, &binding.id, &remote);
+        ws.sync_resolve(&binding.id, 2, "local", "", "").unwrap();
+        ws.sync_capture(&binding.id).unwrap();
+        let job = ws.sync_next(&binding.id).unwrap().unwrap();
+        let payload = ws.sync_commit_payload(&job).unwrap();
+        assert_eq!(payload["base_revision"], 2);
+        assert_eq!(payload["operation"], "delete");
+        assert_eq!(ws.pending_count().unwrap(), 1);
+    }
+}
diff --git a/frontend/src-tauri/src/sync_state.rs b/frontend/src-tauri/src/sync_state.rs
index de98448..84b6231 100644
--- a/frontend/src-tauri/src/sync_state.rs
+++ b/frontend/src-tauri/src/sync_state.rs
@@ -104,7 +104,6 @@ impl Workspace {
         {
             return Err(HostError::new("SYNC_HASH_INVALID"));
         }
-        self.resolve(&format!("attachments/{digest}"))?; // Enforce the platform's general path rules.
         let root = self.root.join(".ainote/sync-spool");
         if root.exists() {
             let meta = fs::symlink_metadata(&root)?;
@@ -163,17 +162,29 @@ impl Workspace {
     }
     pub fn sync_next(&self, binding: &str) -> Result<Option<Job>> {
         self.check_binding(binding)?;
-        Ok(self.db.query_row("SELECT binding,operation_id,file_id,path,hash,size,operation,state,base_revision,upload_id FROM sync_jobs WHERE binding=?1 AND state NOT IN ('acked','archived') ORDER BY rowid LIMIT 1", [binding], |r| {
+        Ok(self.db.query_row("SELECT binding,operation_id,file_id,path,hash,size,operation,state,base_revision,upload_id FROM sync_jobs WHERE binding=?1 AND state NOT IN ('acked','archived','conflict') AND NOT EXISTS (SELECT 1 FROM sync_conflicts c WHERE c.binding=sync_jobs.binding AND c.file_id=sync_jobs.file_id AND c.state='open') ORDER BY rowid LIMIT 1", [binding], |r| {
             Ok(Job { binding:r.get(0)?,operation_id:r.get(1)?,file_id:r.get(2)?,path:r.get(3)?,hash:r.get(4)?,size:r.get(5)?,operation:r.get(6)?,state:r.get(7)?,base_revision:r.get(8)?,upload_id:r.get(9)? })
         }).optional()?)
     }
-    pub fn sync_upload(&self, job: &Job, upload: Option<&str>) -> Result<()> {
+    fn check_job(&self, job: &Job) -> Result<()> {
         self.check_binding(&job.binding)?;
+        let state: String = self.db.query_row(
+            "SELECT state FROM sync_jobs WHERE binding=?1 AND operation_id=?2",
+            params![job.binding, job.operation_id],
+            |r| r.get(0),
+        )?;
+        if matches!(state.as_str(), "archived" | "conflict") {
+            return Err(HostError::new("SYNC_OPERATION_SUPERSEDED"));
+        }
+        Ok(())
+    }
+    pub fn sync_upload(&self, job: &Job, upload: Option<&str>) -> Result<()> {
+        self.check_job(job)?;
         self.db.execute("UPDATE sync_jobs SET state='uploading',upload_id=?3 WHERE binding=?1 AND operation_id=?2 AND base_revision IS NULL", params![job.binding,job.operation_id,upload])?;
         Ok(())
     }
     pub fn sync_commit_payload(&self, job: &Job) -> Result<serde_json::Value> {
-        self.check_binding(&job.binding)?;
+        self.check_job(job)?;
         // The base is frozen exactly once. A response loss reuses the byte-equivalent payload.
         self.db.execute("UPDATE sync_jobs SET state='committing',base_revision=COALESCE((SELECT revision FROM sync_heads WHERE binding=?1 AND file_id=?3),0) WHERE binding=?1 AND operation_id=?2 AND base_revision IS NULL",
             params![job.binding,job.operation_id,job.file_id])?;
diff --git a/frontend/src-tauri/src/workspace.rs b/frontend/src-tauri/src/workspace.rs
index f92ddcf..293a088 100644
--- a/frontend/src-tauri/src/workspace.rs
+++ b/frontend/src-tauri/src/workspace.rs
@@ -135,10 +135,10 @@ impl Workspace {
         let db = Connection::open(db_path)?;
         db.execute_batch("PRAGMA journal_mode=WAL; PRAGMA synchronous=FULL;")?;
         let version: i64 = db.query_row("PRAGMA user_version", [], |r| r.get(0))?;
-        if version > 4 {
+        if version > 5 {
             return Err(HostError::new("SCHEMA_INCOMPATIBLE"));
         }
-        if (1..4).contains(&version) {
+        if (1..5).contains(&version) {
             // Independent, complete SQLite backup before the schema ownership change.
             let backup = managed.join(format!("host-schema{version}-{}.sqlite3", Uuid::new_v4()));
             db.execute("VACUUM INTO ?1", [backup.to_string_lossy().as_ref()])?;
@@ -156,7 +156,8 @@ impl Workspace {
             CREATE TABLE IF NOT EXISTS sync_heads (binding TEXT NOT NULL,file_id TEXT NOT NULL,revision INTEGER NOT NULL,path TEXT NOT NULL,hash TEXT NOT NULL,PRIMARY KEY(binding,file_id));
             CREATE TABLE IF NOT EXISTS sync_windows (binding TEXT PRIMARY KEY,boundary INTEGER NOT NULL);
             CREATE TABLE IF NOT EXISTS sync_inbox (binding TEXT NOT NULL,sequence INTEGER NOT NULL,revision TEXT NOT NULL,operation_id TEXT NOT NULL,rename_id TEXT NOT NULL,state TEXT NOT NULL,PRIMARY KEY(binding,sequence));
-            CREATE TABLE IF NOT EXISTS sync_conflicts (binding TEXT NOT NULL,sequence INTEGER NOT NULL,file_id TEXT NOT NULL,local_path TEXT NOT NULL,local_hash TEXT NOT NULL,remote TEXT NOT NULL,state TEXT NOT NULL,PRIMARY KEY(binding,sequence));")?;
+            CREATE TABLE IF NOT EXISTS sync_conflicts (binding TEXT NOT NULL,sequence INTEGER NOT NULL,file_id TEXT NOT NULL,local_path TEXT NOT NULL,local_hash TEXT NOT NULL,remote TEXT NOT NULL,state TEXT NOT NULL,PRIMARY KEY(binding,sequence));
+            CREATE TABLE IF NOT EXISTS sync_resolutions (binding TEXT NOT NULL,sequence INTEGER NOT NULL,choice TEXT NOT NULL,destination TEXT NOT NULL,expected TEXT NOT NULL,operation_id TEXT NOT NULL,rename_id TEXT NOT NULL,copy_id TEXT NOT NULL,state TEXT NOT NULL,PRIMARY KEY(binding,sequence));")?;
         let has_origin: bool = db.query_row(
             "SELECT EXISTS(SELECT 1 FROM pragma_table_info('file_ops') WHERE name='origin')",
             [],
@@ -168,7 +169,7 @@ impl Workspace {
                 [],
             )?;
         }
-        db.execute_batch("PRAGMA user_version=4; COMMIT;")?;
+        db.execute_batch("PRAGMA user_version=5; COMMIT;")?;
         let vault_id: String = db
             .query_row("SELECT id FROM identity", [], |r| r.get(0))
             .optional()?
@@ -429,7 +430,41 @@ impl Workspace {
         if current != expected {
             return Err(HostError::new("REVISION_CONFLICT"));
         }
-        let previous = self.entry(path)?;
+        let mut previous = self.entry(path)?;
+        if let Some(id) = identity {
+            // Tombstone metadata can yield its old path to a new remote identity.
+            if let Some(retired) = previous
+                .as_ref()
+                .filter(|entry| entry.deleted && entry.file_id != id)
+            {
+                self.db.execute(
+                    "UPDATE files SET path=?2 WHERE id=?1 AND deleted=1",
+                    params![
+                        retired.file_id,
+                        format!(".ainote/retired/{}", retired.file_id)
+                    ],
+                )?;
+                previous = None;
+            }
+            if previous.is_none() {
+                let retired: Option<(String, bool)> = self
+                    .db
+                    .query_row("SELECT path,deleted FROM files WHERE id=?1", [id], |r| {
+                        Ok((r.get(0)?, r.get(1)?))
+                    })
+                    .optional()?;
+                if let Some((_, deleted)) = retired {
+                    if !deleted {
+                        return Err(HostError::new("PATH_CONFLICT"));
+                    }
+                    self.db.execute(
+                        "UPDATE files SET path=?2 WHERE id=?1 AND deleted=1",
+                        params![id, path],
+                    )?;
+                    previous = self.entry(path)?;
+                }
+            }
+        }
         if identity.is_some_and(|id| previous.as_ref().is_some_and(|entry| entry.file_id != id)) {
             return Err(HostError::new("PATH_CONFLICT"));
         }
diff --git a/frontend/src-tauri/tests/sync_push.rs b/frontend/src-tauri/tests/sync_push.rs
index 0c6ba2d..5ddc86c 100644
--- a/frontend/src-tauri/tests/sync_push.rs
+++ b/frontend/src-tauri/tests/sync_push.rs
@@ -220,4 +220,87 @@ async fn actual_service_accepts_ordered_push_and_repeat_commit_without_duplicate
             .cursor,
         21
     );
+    // All three explicit choices converge; the local copy gets an independent file ID.
+    for (iteration, choice) in ["local", "remote", "copy"].into_iter().enumerate() {
+        if iteration > 0 {
+            for (ws, content) in [(&workspace, "next-a"), (&workspace_b, "next-b")] {
+                let mut ws = ws.lock().unwrap();
+                let current = ws.read("note.md").unwrap();
+                ws.write("note.md", &current.entry.hash, content.as_bytes(), "local")
+                    .unwrap();
+            }
+            assert!(client.push_one(&workspace, &binding).await.unwrap());
+            assert_eq!(
+                client_b.pull_page(&workspace_b, &binding_b).await.unwrap(),
+                1
+            );
+        }
+        {
+            let mut ws = workspace_b.lock().unwrap();
+            let conflict = ws.sync_conflicts(&binding_b.id).unwrap().remove(0);
+            let sequence = conflict["sequence"].as_i64().unwrap();
+            let expected = ws.read("note.md").unwrap().entry.hash;
+            assert_eq!(
+                ws.sync_resolve(
+                    &binding_b.id,
+                    sequence,
+                    choice,
+                    if choice == "copy" { "copy.md" } else { "" },
+                    "wrong"
+                )
+                .unwrap_err()
+                .code,
+                "REVISION_CONFLICT"
+            );
+            ws.sync_resolve(
+                &binding_b.id,
+                sequence,
+                choice,
+                if choice == "copy" { "copy.md" } else { "" },
+                &expected,
+            )
+            .unwrap();
+            assert!(ws.sync_conflicts(&binding_b.id).unwrap().is_empty());
+            // Repeating a persisted decision is harmless.
+            ws.sync_resolve(
+                &binding_b.id,
+                sequence,
+                choice,
+                if choice == "copy" { "copy.md" } else { "" },
+                &expected,
+            )
+            .unwrap();
+        }
+        while client_b.push_one(&workspace_b, &binding_b).await.unwrap() {}
+        client.pull_page(&workspace, &binding).await.unwrap();
+        client_b.pull_page(&workspace_b, &binding_b).await.unwrap();
+        let expected = if choice == "local" {
+            "offline-b"
+        } else {
+            "next-a"
+        };
+        assert_eq!(
+            workspace.lock().unwrap().read("note.md").unwrap().content,
+            expected
+        );
+        assert_eq!(
+            workspace_b.lock().unwrap().read("note.md").unwrap().content,
+            expected
+        );
+        if choice == "copy" {
+            let copy = workspace.lock().unwrap().read("copy.md").unwrap();
+            assert_eq!(copy.content, "next-b");
+            assert_ne!(copy.entry.file_id, first.file_id);
+            assert_eq!(
+                copy.entry.file_id,
+                workspace_b
+                    .lock()
+                    .unwrap()
+                    .read("copy.md")
+                    .unwrap()
+                    .entry
+                    .file_id
+            );
+        }
+    }
 }