diff --git a/projects/msp-tools/guru-rmm/server/migrations/006_tunnel_sessions.sql b/projects/msp-tools/guru-rmm/server/migrations/006_tunnel_sessions.sql
index bd086db..d925d65 100644
--- a/projects/msp-tools/guru-rmm/server/migrations/006_tunnel_sessions.sql
+++ b/projects/msp-tools/guru-rmm/server/migrations/006_tunnel_sessions.sql
@@ -11,11 +11,13 @@ CREATE TABLE tech_sessions (
     opened_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
     last_activity TIMESTAMPTZ NOT NULL DEFAULT NOW(),
     closed_at TIMESTAMPTZ,
-    status VARCHAR(20) NOT NULL DEFAULT 'active',
-    CONSTRAINT unique_active_session UNIQUE (tech_id, agent_id, status)
-        WHERE status = 'active'
+    status VARCHAR(20) NOT NULL DEFAULT 'active'
 );
 
+-- Partial unique index to ensure only one active session per tech-agent pair
+CREATE UNIQUE INDEX unique_active_session ON tech_sessions(tech_id, agent_id, status)
+    WHERE status = 'active';
+
 -- Index for finding sessions by technician
 CREATE INDEX idx_tech_sessions_tech ON tech_sessions(tech_id);