diff --git a/services/delivery-platform-api/src/main/resources/db/migration/V7__device_management.sql b/services/delivery-platform-api/src/main/resources/db/migration/V7__device_management.sql
new file mode 100644
index 0000000..f67480b
--- /dev/null
+++ b/services/delivery-platform-api/src/main/resources/db/migration/V7__device_management.sql
@@ -0,0 +1,49 @@
+-- V7__device_management.sql
+-- M7：设备主表
+CREATE TABLE platform_device (
+    id BIGSERIAL PRIMARY KEY,
+    mid VARCHAR(128) NOT NULL UNIQUE,
+    alias VARCHAR(256),
+    site VARCHAR(256),
+    customer_id BIGINT REFERENCES platform_customer(id),
+    project_id BIGINT REFERENCES platform_project(id),
+    status VARCHAR(32) NOT NULL DEFAULT 'ACTIVE',
+    first_seen_at TIMESTAMP WITH TIME ZONE,
+    last_heartbeat_at TIMESTAMP WITH TIME ZONE,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_platform_device_customer ON platform_device(customer_id);
+CREATE INDEX idx_platform_device_project ON platform_device(project_id);
+CREATE INDEX idx_platform_device_status ON platform_device(status);
+
+-- M7：设备↔SN 绑定历史
+CREATE TABLE platform_device_sn_binding (
+    id BIGSERIAL PRIMARY KEY,
+    device_id BIGINT NOT NULL REFERENCES platform_device(id),
+    license_sn_id BIGINT NOT NULL REFERENCES platform_license_sn(id),
+    bind_type VARCHAR(32) NOT NULL DEFAULT 'ACTIVATE',
+    bind_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    remark TEXT,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_binding_device ON platform_device_sn_binding(device_id);
+CREATE INDEX idx_binding_sn ON platform_device_sn_binding(license_sn_id);
+
+-- M7：换机申请
+CREATE TABLE platform_device_swap_request (
+    id BIGSERIAL PRIMARY KEY,
+    old_device_id BIGINT NOT NULL REFERENCES platform_device(id),
+    new_mid VARCHAR(128) NOT NULL,
+    sn_id BIGINT NOT NULL REFERENCES platform_license_sn(id),
+    reason VARCHAR(512),
+    status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
+    processed_by VARCHAR(256),
+    processed_at TIMESTAMP WITH TIME ZONE,
+    remark TEXT,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_swap_status ON platform_device_swap_request(status);