feat(server): store and expose last updated date of gtfs data

shared/src/commonMain/kotlin/moe/lava/banksia/di/CommonModules.kt

@@ -7,6 +7,7 @@ val CommonModules = module {
     includes(PlatformModule)
 
     single { Database.build(get<PlatformDatabaseBuilder>().getBuilder()) }
+    single { get<Database>().versionMetadataDao }
     single { get<Database>().routeDao }
     single { get<Database>().shapeDao }
     single { get<Database>().stopDao }

shared/src/commonMain/kotlin/moe/lava/banksia/model/VersionMetadata.kt

@@ -0,0 +1,9 @@
+package moe.lava.banksia.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class VersionMetadata(
+    val type: String,
+    val lastUpdated: Long,
+)

shared/src/commonMain/kotlin/moe/lava/banksia/room/Database.kt

@@ -7,6 +7,7 @@ import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.IO
 import moe.lava.banksia.room.converter.RouteTypeConverter
+import moe.lava.banksia.room.dao.VersionMetadataDao
 import moe.lava.banksia.room.dao.RouteDao
 import moe.lava.banksia.room.dao.ShapeDao
 import moe.lava.banksia.room.dao.StopDao
@@ -17,23 +18,27 @@ import moe.lava.banksia.room.entity.ShapeEntity
 import moe.lava.banksia.room.entity.StopEntity
 import moe.lava.banksia.room.entity.StopTimeEntity
 import moe.lava.banksia.room.entity.TripEntity
+import moe.lava.banksia.room.entity.VersionMetadataEntity
 import androidx.room.Database as DatabaseAnnotation
 
 @DatabaseAnnotation(
-    version = 2,
+    version = 3,
     entities = [
         RouteEntity::class,
         ShapeEntity::class,
         StopEntity::class,
         StopTimeEntity::class,
         TripEntity::class,
+        VersionMetadataEntity::class,
     ],
     autoMigrations = [
         AutoMigration(from = 1, to = 2),
+        AutoMigration(from = 2, to = 3),
     ]
 )
 @TypeConverters(RouteTypeConverter::class)
 abstract class Database : RoomDatabase() {
+    abstract val versionMetadataDao: VersionMetadataDao
     abstract val routeDao: RouteDao
     abstract val shapeDao: ShapeDao
     abstract val stopDao: StopDao

shared/src/commonMain/kotlin/moe/lava/banksia/room/dao/VersionMetadataDao.kt

@@ -0,0 +1,27 @@
+package moe.lava.banksia.room.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy.Companion.REPLACE
+import androidx.room.Query
+import moe.lava.banksia.room.entity.VersionMetadataEntity
+
+@Dao
+interface VersionMetadataDao {
+    @Query("SELECT * FROM VersionMetadata WHERE type == :type")
+    suspend fun get(type: String): VersionMetadataEntity?
+
+    @Query("SELECT * FROM VersionMetadata")
+    suspend fun getAll(): List<VersionMetadataEntity>
+
+    @Insert(onConflict = REPLACE)
+    suspend fun update(vararg data: VersionMetadataEntity)
+
+    suspend fun update(vararg data: Pair<String, Long>) {
+        update(*data.map { (type, lastUpdated) -> VersionMetadataEntity(type, lastUpdated) }.toTypedArray())
+    }
+
+    suspend fun update(lastUpdated: Long, types: Collection<String>) {
+        update(*types.map { VersionMetadataEntity(it, lastUpdated) }.toTypedArray())
+    }
+}

shared/src/commonMain/kotlin/moe/lava/banksia/room/entity/VersionMetadataEntity.kt

@@ -0,0 +1,19 @@
+package moe.lava.banksia.room.entity
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import moe.lava.banksia.model.VersionMetadata
+
+@Entity(
+    "VersionMetadata",
+)
+data class VersionMetadataEntity(
+    /** Entity type this metadata applies to */
+    @PrimaryKey val type: String,
+    /** Last updated */
+    val lastUpdated: Long,
+) {
+    fun asModel() = VersionMetadata(type, lastUpdated)
+}
+
+fun VersionMetadata.asEntity() = VersionMetadataEntity(type, lastUpdated)