feat(db): device_readings 新增 metric 字段用于多行拆分存储

crates/erp-server/migration/src/lib.rs

@@ -91,6 +91,7 @@ mod m20260428_000088_rls_policy_strict;
 mod m20260428_000089_blind_indexes;
 mod m20260428_000090_critical_alerts;
 mod m20260428_000091_dead_letter_events;
+mod m20260429_000092_device_readings_metric;
 
 pub struct Migrator;
 
@@ -189,6 +190,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20260428_000089_blind_indexes::Migration),
             Box::new(m20260428_000090_critical_alerts::Migration),
             Box::new(m20260428_000091_dead_letter_events::Migration),
+            Box::new(m20260429_000092_device_readings_metric::Migration),
         ]
     }
 }

crates/erp-server/migration/src/m20260429_000092_device_readings_metric.rs

@@ -0,0 +1,48 @@
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .alter_table(
+                Table::alter()
+                    .table(Alias::new("device_readings"))
+                    .add_column(ColumnDef::new(Alias::new("metric")).string().null())
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_dr_metric")
+                    .table(Alias::new("device_readings"))
+                    .col(Alias::new("tenant_id"))
+                    .col(Alias::new("patient_id"))
+                    .col(Alias::new("metric"))
+                    .col(Alias::new("measured_at"))
+                    .to_owned(),
+            )
+            .await?;
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_index(Index::drop().name("idx_dr_metric").to_owned())
+            .await?;
+
+        manager
+            .alter_table(
+                Table::alter()
+                    .table(Alias::new("device_readings"))
+                    .drop_column(Alias::new("metric"))
+                    .to_owned(),
+            )
+            .await
+    }
+}