Initial work on getting minimal API to work

AS1024.GeoFeed.Core.GeoFeedLocalCache/GeoFeedSqliteLocalCache/GeoFeedCacheDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+{
+    public class GeoFeedCacheDbContext : DbContext
+    {
+        public GeoFeedCacheDbContext(DbContextOptions options)
+            : base(options)
+        {
+        }
+
+        public virtual DbSet<GeoFeedCacheEntry> GeoFeedCacheEntries { get; set; }
+    }
+
+}

AS1024.GeoFeed.Core.GeoFeedLocalCache/GeoFeedSqliteLocalCache/GeoFeedCacheEntry.cs

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+using AS1024.GeoFeed.Models;
+using System.ComponentModel.DataAnnotations;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+{
+    public class GeoFeedCacheEntry : IPGeoFeed
+    {
+        [Key]
+        public int Id { get; set; }
+    }
+
+}

AS1024.GeoFeed.Core.GeoFeedLocalCache/GeoFeedSqliteLocalCache/GeoFeedCacheService.cs

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+using AS1024.GeoFeed.Core.Interfaces;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System.Runtime.CompilerServices;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+{
+    public class GeoFeedCacheService : IHostedService
+    {
+        private readonly ILogger<GeoFeedCacheService> logger;
+        private readonly IGeoFeedProvider feedProvider;
+        private readonly IHost host;
+        private readonly IGeoFeedPersistentCacheProvider persistentCacheProvider;
+
+        public GeoFeedCacheService(ILogger<GeoFeedCacheService> logger,
+        IGeoFeedProvider feedProvider,
+        IHost host,
+        IGeoFeedPersistentCacheProvider persistentCacheProvider)
+        {
+            this.logger = logger;
+            this.feedProvider = feedProvider;
+            this.host = host;
+            this.persistentCacheProvider = persistentCacheProvider;
+        }
+
+        public Task StartAsync(CancellationToken cancellationToken)
+        {
+            _ = StartPerioidicSync(cancellationToken);
+            return Task.CompletedTask;
+        }
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+
+        public async Task<bool> StartPerioidicSync(CancellationToken Token)
+        {
+            while (!Token.IsCancellationRequested)
+            {
+                try
+                {
+                    var results = await feedProvider.GetGeoFeedData();
+                    await persistentCacheProvider.CacheGeoFeed(results);
+                }
+                catch (Exception)
+                {
+                    logger.LogWarning("On disk cache failed to run. Waiting on 30 minutes before retry...");
+                }
+                await Task.Delay(TimeSpan.FromMinutes(30));
+            }
+
+            return false;
+        }
+    }
+}

AS1024.GeoFeed.Core.GeoFeedLocalCache/GeoFeedSqliteLocalCache/GeoFeedDesignTimeMigration.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+
+{
+    public class GeoFeedDesignTimeMigration : IDesignTimeDbContextFactory<GeoFeedCacheDbContext>
+    {
+        public GeoFeedCacheDbContext CreateDbContext(string[] args)
+        {
+            var builder = new DbContextOptionsBuilder<GeoFeedCacheDbContext>();
+            builder.UseSqlite("Data Source=migratedb.db");
+            return new GeoFeedCacheDbContext(builder.Options);
+        }
+    }
+
+}

AS1024.GeoFeed.Core.GeoFeedLocalCache/GeoFeedSqliteLocalCache/GeoFeedSqliteCache.cs

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+using AS1024.GeoFeed.Core.Interfaces;
+using AS1024.GeoFeed.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Hosting;
+using AS1024.GeoFeed.Core.Tools;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+{
+    public class GeoFeedSqliteCache : IGeoFeedPersistentCacheProvider
+    {
+        protected readonly GeoFeedCacheDbContext dbContext;
+        private readonly IGeoFeedProvider feedProvider;
+
+        public GeoFeedSqliteCache(GeoFeedCacheDbContext geoFeedCacheDb,
+                                  IHost host,
+                                  IGeoFeedProvider provider)
+        {
+            dbContext = geoFeedCacheDb;
+            feedProvider = provider;
+        }
+
+        public string ProviderName => "sqlite";
+
+        public async Task<bool> CacheGeoFeed(IList<IPGeoFeed> pGeoFeeds)
+        {
+            await DBContextMigrate();
+            List<GeoFeedCacheEntry> geoFeedCacheEntry = [];
+
+            var results = pGeoFeeds.ToList();
+
+            results.ForEach(x =>
+            {
+                geoFeedCacheEntry.Add(new()
+                {
+                    Prefix = x.Prefix,
+                    GeolocCity = x.GeolocCity,
+                    GeolocCountry = x.GeolocCountry,
+                    GeolocHasLocation = x.GeolocHasLocation,
+                    GeolocPostalCode = x.GeolocPostalCode,
+                    GeolocRegion = x.GeolocRegion
+                });
+            });
+
+            if (dbContext.GeoFeedCacheEntries.Any())
+            {
+                dbContext.GeoFeedCacheEntries.RemoveRange(dbContext.GeoFeedCacheEntries.ToArray());
+            }
+            await dbContext.AddRangeAsync(geoFeedCacheEntry);
+            await dbContext.SaveChangesAsync();
+
+            return true;
+        }
+
+        public string GetGeoFeed()
+        {
+            var results =
+                dbContext.GeoFeedCacheEntries.ToList();
+            List<IPGeoFeed> cachedData = [];
+            results.ForEach(cachedData.Add);
+
+            return cachedData.ToGeoFeedCsv();
+        }
+
+        private async Task DBContextMigrate()
+        {
+            if (dbContext.Database.GetPendingMigrations().Any())
+            {
+                await dbContext.Database.MigrateAsync();
+            }
+        }
+    }
+}