feat: include data connections and SMTP in artifact deployment

src/ScadaLink.SiteRuntime/Persistence/SiteStorageService.cs

@@ -78,6 +78,13 @@ public class SiteStorageService
                 updated_at           TEXT NOT NULL
             );
 
+            CREATE TABLE IF NOT EXISTS data_connection_definitions (
+                name             TEXT PRIMARY KEY,
+                protocol         TEXT NOT NULL,
+                configuration    TEXT,
+                updated_at       TEXT NOT NULL
+            );
+
             CREATE TABLE IF NOT EXISTS smtp_configurations (
                 name                 TEXT PRIMARY KEY,
                 server               TEXT NOT NULL,
@@ -467,6 +474,60 @@ public class SiteStorageService
 
         await command.ExecuteNonQueryAsync();
     }
+
+    // ── Data Connection Definition CRUD ──
+
+    /// <summary>
+    /// Stores or updates a data connection definition (OPC UA endpoint, etc.).
+    /// </summary>
+    public async Task StoreDataConnectionDefinitionAsync(string name, string protocol, string? configJson)
+    {
+        await using var connection = new SqliteConnection(_connectionString);
+        await connection.OpenAsync();
+
+        await using var command = connection.CreateCommand();
+        command.CommandText = @"
+            INSERT INTO data_connection_definitions (name, protocol, configuration, updated_at)
+            VALUES (@name, @protocol, @config, @updatedAt)
+            ON CONFLICT(name) DO UPDATE SET
+                protocol = excluded.protocol,
+                configuration = excluded.configuration,
+                updated_at = excluded.updated_at";
+
+        command.Parameters.AddWithValue("@name", name);
+        command.Parameters.AddWithValue("@protocol", protocol);
+        command.Parameters.AddWithValue("@config", (object?)configJson ?? DBNull.Value);
+        command.Parameters.AddWithValue("@updatedAt", DateTimeOffset.UtcNow.ToString("O"));
+
+        await command.ExecuteNonQueryAsync();
+        _logger.LogDebug("Stored data connection definition '{Name}' (protocol={Protocol})", name, protocol);
+    }
+
+    /// <summary>
+    /// Returns all stored data connection definitions.
+    /// </summary>
+    public async Task<List<StoredDataConnectionDefinition>> GetAllDataConnectionDefinitionsAsync()
+    {
+        await using var connection = new SqliteConnection(_connectionString);
+        await connection.OpenAsync();
+
+        await using var command = connection.CreateCommand();
+        command.CommandText = "SELECT name, protocol, configuration FROM data_connection_definitions";
+
+        var results = new List<StoredDataConnectionDefinition>();
+        await using var reader = await command.ExecuteReaderAsync();
+        while (await reader.ReadAsync())
+        {
+            results.Add(new StoredDataConnectionDefinition
+            {
+                Name = reader.GetString(0),
+                Protocol = reader.GetString(1),
+                ConfigurationJson = reader.IsDBNull(2) ? null : reader.GetString(2)
+            });
+        }
+
+        return results;
+    }
 }
 
 /// <summary>
@@ -492,3 +553,13 @@ public class StoredSharedScript
     public string? ParameterDefinitions { get; init; }
     public string? ReturnDefinition { get; init; }
 }
+
+/// <summary>
+/// Represents a data connection definition stored locally in SQLite.
+/// </summary>
+public class StoredDataConnectionDefinition
+{
+    public string Name { get; init; } = string.Empty;
+    public string Protocol { get; init; } = string.Empty;
+    public string? ConfigurationJson { get; init; }
+}