diff --git a/src-tauri/src/models/mod.rs b/src-tauri/src/models/mod.rs
index ef2d98b..5caa5db 100644
--- a/src-tauri/src/models/mod.rs
+++ b/src-tauri/src/models/mod.rs
@@ -1,3 +1,4 @@
 pub mod credential;
 pub mod project;
+pub mod ticket;
 pub mod tracker;
diff --git a/src-tauri/src/models/ticket.rs b/src-tauri/src/models/ticket.rs
new file mode 100644
index 0000000..d321f9b
--- /dev/null
+++ b/src-tauri/src/models/ticket.rs
@@ -0,0 +1,239 @@
+use rusqlite::{params, Connection, Result};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ProcessedTicket {
+    pub id: String,
+    pub tracker_id: String,
+    pub artifact_id: i32,
+    pub artifact_title: String,
+    pub artifact_data: String,
+    pub status: String,
+    pub analyst_report: Option<String>,
+    pub developer_report: Option<String>,
+    pub worktree_path: Option<String>,
+    pub branch_name: Option<String>,
+    pub detected_at: String,
+    pub processed_at: Option<String>,
+}
+
+fn from_row(row: &rusqlite::Row) -> rusqlite::Result<ProcessedTicket> {
+    Ok(ProcessedTicket {
+        id: row.get(0)?,
+        tracker_id: row.get(1)?,
+        artifact_id: row.get(2)?,
+        artifact_title: row.get(3)?,
+        artifact_data: row.get(4)?,
+        status: row.get(5)?,
+        analyst_report: row.get(6)?,
+        developer_report: row.get(7)?,
+        worktree_path: row.get(8)?,
+        branch_name: row.get(9)?,
+        detected_at: row.get(10)?,
+        processed_at: row.get(11)?,
+    })
+}
+
+const SELECT_ALL_COLS: &str = "SELECT id, tracker_id, artifact_id, artifact_title, artifact_data, \
+    status, analyst_report, developer_report, worktree_path, branch_name, \
+    detected_at, processed_at FROM processed_tickets";
+
+impl ProcessedTicket {
+    /// Insert a new ticket if one with the same (tracker_id, artifact_id) doesn't exist.
+    /// Returns Some(ticket) if inserted, None if it was a duplicate.
+    pub fn insert_if_new(
+        conn: &Connection,
+        tracker_id: &str,
+        artifact_id: i32,
+        artifact_title: &str,
+        artifact_data: &str,
+    ) -> Result<Option<ProcessedTicket>> {
+        if Self::exists(conn, tracker_id, artifact_id)? {
+            return Ok(None);
+        }
+
+        let id = Uuid::new_v4().to_string();
+        let now = chrono::Utc::now().to_rfc3339();
+
+        conn.execute(
+            "INSERT INTO processed_tickets \
+             (id, tracker_id, artifact_id, artifact_title, artifact_data, status, detected_at) \
+             VALUES (?1, ?2, ?3, ?4, ?5, 'Pending', ?6)",
+            params![id, tracker_id, artifact_id, artifact_title, artifact_data, now],
+        )?;
+
+        let ticket = ProcessedTicket {
+            id,
+            tracker_id: tracker_id.to_string(),
+            artifact_id,
+            artifact_title: artifact_title.to_string(),
+            artifact_data: artifact_data.to_string(),
+            status: "Pending".to_string(),
+            analyst_report: None,
+            developer_report: None,
+            worktree_path: None,
+            branch_name: None,
+            detected_at: now,
+            processed_at: None,
+        };
+
+        Ok(Some(ticket))
+    }
+
+    /// Returns true if a ticket with (tracker_id, artifact_id) already exists.
+    pub fn exists(conn: &Connection, tracker_id: &str, artifact_id: i32) -> Result<bool> {
+        let count: i64 = conn.query_row(
+            "SELECT COUNT(*) FROM processed_tickets WHERE tracker_id = ?1 AND artifact_id = ?2",
+            params![tracker_id, artifact_id],
+            |row| row.get(0),
+        )?;
+        Ok(count > 0)
+    }
+
+    pub fn list_by_tracker(conn: &Connection, tracker_id: &str) -> Result<Vec<ProcessedTicket>> {
+        let sql = format!(
+            "{} WHERE tracker_id = ?1 ORDER BY detected_at DESC",
+            SELECT_ALL_COLS
+        );
+        let mut stmt = conn.prepare(&sql)?;
+        let rows = stmt.query_map(params![tracker_id], from_row)?;
+        rows.collect()
+    }
+
+    pub fn list_by_project(conn: &Connection, project_id: &str) -> Result<Vec<ProcessedTicket>> {
+        let mut stmt = conn.prepare(
+            "SELECT pt.id, pt.tracker_id, pt.artifact_id, pt.artifact_title, pt.artifact_data, \
+             pt.status, pt.analyst_report, pt.developer_report, pt.worktree_path, pt.branch_name, \
+             pt.detected_at, pt.processed_at \
+             FROM processed_tickets pt \
+             JOIN watched_trackers wt ON pt.tracker_id = wt.id \
+             WHERE wt.project_id = ?1 \
+             ORDER BY pt.detected_at DESC",
+        )?;
+        let rows = stmt.query_map(params![project_id], from_row)?;
+        rows.collect()
+    }
+
+    pub fn get_by_id(conn: &Connection, id: &str) -> Result<ProcessedTicket> {
+        let sql = format!("{} WHERE id = ?1", SELECT_ALL_COLS);
+        conn.query_row(&sql, params![id], from_row)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db;
+    use crate::models::project::Project;
+    use crate::models::tracker::{AgentConfig, WatchedTracker};
+
+    fn setup() -> (Connection, String) {
+        let conn = db::init_in_memory().expect("db init should succeed");
+        let project = Project::insert(&conn, "Test", "/path", None, "main").unwrap();
+        let agent_config = AgentConfig {
+            analyst_command: "claude".into(),
+            analyst_args: vec![],
+            developer_command: "claude".into(),
+            developer_args: vec![],
+        };
+        let tracker =
+            WatchedTracker::insert(&conn, &project.id, 456, "Bugs", 10, agent_config, vec![])
+                .unwrap();
+        (conn, tracker.id)
+    }
+
+    #[test]
+    fn test_insert_if_new_creates_ticket() {
+        let (conn, tracker_id) = setup();
+
+        let result = ProcessedTicket::insert_if_new(
+            &conn,
+            &tracker_id,
+            101,
+            "Fix login bug",
+            "{\"id\": 101}",
+        )
+        .expect("insert_if_new should succeed");
+
+        assert!(result.is_some());
+        let ticket = result.unwrap();
+        assert_eq!(ticket.status, "Pending");
+        assert_eq!(ticket.tracker_id, tracker_id);
+        assert_eq!(ticket.artifact_id, 101);
+        assert_eq!(ticket.artifact_title, "Fix login bug");
+        assert!(ticket.analyst_report.is_none());
+        assert!(ticket.processed_at.is_none());
+    }
+
+    #[test]
+    fn test_insert_if_new_returns_none_for_duplicate() {
+        let (conn, tracker_id) = setup();
+
+        let first = ProcessedTicket::insert_if_new(
+            &conn,
+            &tracker_id,
+            202,
+            "Crash on startup",
+            "{\"id\": 202}",
+        )
+        .expect("first insert should succeed");
+        assert!(first.is_some());
+
+        let second = ProcessedTicket::insert_if_new(
+            &conn,
+            &tracker_id,
+            202,
+            "Crash on startup",
+            "{\"id\": 202}",
+        )
+        .expect("second insert_if_new should succeed");
+        assert!(second.is_none());
+    }
+
+    #[test]
+    fn test_exists() {
+        let (conn, tracker_id) = setup();
+
+        let before = ProcessedTicket::exists(&conn, &tracker_id, 303)
+            .expect("exists check should succeed");
+        assert!(!before);
+
+        ProcessedTicket::insert_if_new(&conn, &tracker_id, 303, "Some ticket", "{}")
+            .expect("insert should succeed");
+
+        let after = ProcessedTicket::exists(&conn, &tracker_id, 303)
+            .expect("exists check after insert should succeed");
+        assert!(after);
+    }
+
+    #[test]
+    fn test_list_by_tracker() {
+        let (conn, tracker_id) = setup();
+
+        ProcessedTicket::insert_if_new(&conn, &tracker_id, 1, "Ticket One", "{}").unwrap();
+        ProcessedTicket::insert_if_new(&conn, &tracker_id, 2, "Ticket Two", "{}").unwrap();
+
+        let tickets =
+            ProcessedTicket::list_by_tracker(&conn, &tracker_id).expect("list should succeed");
+        assert_eq!(tickets.len(), 2);
+    }
+
+    #[test]
+    fn test_get_by_id() {
+        let (conn, tracker_id) = setup();
+
+        let inserted =
+            ProcessedTicket::insert_if_new(&conn, &tracker_id, 404, "Not Found Bug", "{\"id\": 404}")
+                .expect("insert should succeed")
+                .expect("should be Some");
+
+        let found =
+            ProcessedTicket::get_by_id(&conn, &inserted.id).expect("get_by_id should succeed");
+
+        assert_eq!(found.id, inserted.id);
+        assert_eq!(found.artifact_id, 404);
+        assert_eq!(found.artifact_title, "Not Found Bug");
+        assert_eq!(found.status, "Pending");
+    }
+}