土壤监测日志模型和数据库迁移

app/Models/SoilMonitoringLog.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class SoilMonitoringLog extends Model
+{
+    use HasFactory;
+
+    protected $casts = [
+        'monitored_at' => 'datetime',
+    ];
+
+    protected $fillable = [
+        'device_id',
+        'agricultural_base_id',
+        'conductivity',
+        'humidity',
+        'temperature',
+        'n',
+        'p',
+        'k',
+        'monitored_at',
+    ];
+}

database/migrations/2022_10_18_164910_create_soil_monitoring_logs_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('soil_monitoring_logs', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('device_id')->comment('设备ID');
+            $table->unsignedBigInteger('agricultural_base_id')->comment('农业基地ID');
+            $table->decimal('conductivity', 8, 2)->nullable()->comment('电导率 (单位: us/cm)');
+            $table->decimal('humidity', 8, 2)->nullable()->comment('湿度 (单位: %RH)');
+            $table->decimal('temperature', 8, 2)->nullable()->comment('温度 (单位: ℃)');
+            $table->integer('n')->nullable()->comment('氮 (单位: mg/kg)');
+            $table->integer('p')->nullable()->comment('磷 (单位: mg/kg)');
+            $table->integer('k')->nullable()->comment('钾 (单位: mg/kg)');
+            $table->timestamp('monitored_at')->comment('监控时间(小时)');
+            $table->timestamps();
+
+            // 索引
+            $table->index('device_id');
+            $table->index('agricultural_base_id');
+            $table->unique('monitored_at');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('soil_monitoring_logs');
+    }
+};