feat(db): add stream_sessions model for phase4 on-demand live flow

Backend/drizzle/0007_live_stream_sessions.sql

@@ -0,0 +1,18 @@
+CREATE TABLE "stream_sessions" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+  "owner_user_id" uuid NOT NULL,
+  "camera_device_id" uuid NOT NULL,
+  "requester_device_id" uuid NOT NULL,
+  "status" varchar(32) DEFAULT 'requested' NOT NULL,
+  "reason" varchar(32) DEFAULT 'on_demand' NOT NULL,
+  "stream_key" varchar(255),
+  "started_at" timestamp with time zone,
+  "ended_at" timestamp with time zone,
+  "metadata" jsonb DEFAULT 'null'::jsonb,
+  "created_at" timestamp with time zone DEFAULT now() NOT NULL,
+  "updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "stream_sessions" ADD CONSTRAINT "stream_sessions_owner_user_id_users_id_fk" FOREIGN KEY ("owner_user_id") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "stream_sessions" ADD CONSTRAINT "stream_sessions_camera_device_id_devices_id_fk" FOREIGN KEY ("camera_device_id") REFERENCES "public"."devices"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "stream_sessions" ADD CONSTRAINT "stream_sessions_requester_device_id_devices_id_fk" FOREIGN KEY ("requester_device_id") REFERENCES "public"."devices"("id") ON DELETE no action ON UPDATE no action;

Backend/drizzle/meta/_journal.json

@@ -50,6 +50,13 @@
       "when": 1770413956419,
       "tag": "0006_steady_control_plane",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "7",
+      "when": 1770414956419,
+      "tag": "0007_live_stream_sessions",
+      "breakpoints": true
     }
   ]
 }