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src/__Libraries/StellaOps.Infrastructure.Postgres/Options/PersistenceBackend.cs

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+namespace StellaOps.Infrastructure.Postgres.Options;
+
+/// <summary>
+/// Persistence backend selection for dual-write/migration scenarios.
+/// </summary>
+public enum PersistenceBackend
+{
+    /// <summary>
+    /// Use MongoDB as the primary backend (legacy).
+    /// </summary>
+    Mongo,
+
+    /// <summary>
+    /// Use PostgreSQL as the primary backend.
+    /// </summary>
+    Postgres,
+
+    /// <summary>
+    /// Dual-write mode: write to both backends, read from primary.
+    /// Used during migration phase for data consistency verification.
+    /// </summary>
+    DualWrite
+}
+
+/// <summary>
+/// Persistence options for module backend selection.
+/// </summary>
+public sealed class PersistenceOptions
+{
+    /// <summary>
+    /// Configuration section name.
+    /// </summary>
+    public const string SectionName = "Persistence";
+
+    /// <summary>
+    /// Backend for Authority module.
+    /// </summary>
+    public PersistenceBackend Authority { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Backend for Scheduler module.
+    /// </summary>
+    public PersistenceBackend Scheduler { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Backend for Notify module.
+    /// </summary>
+    public PersistenceBackend Notify { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Backend for Policy module.
+    /// </summary>
+    public PersistenceBackend Policy { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Backend for Concelier (vulnerability) module.
+    /// </summary>
+    public PersistenceBackend Concelier { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Backend for Excititor (VEX/graph) module.
+    /// </summary>
+    public PersistenceBackend Excititor { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// In dual-write mode, which backend to read from.
+    /// </summary>
+    public PersistenceBackend DualWriteReadFrom { get; set; } = PersistenceBackend.Mongo;
+
+    /// <summary>
+    /// Enable comparison logging in dual-write mode.
+    /// Logs discrepancies between backends for debugging.
+    /// </summary>
+    public bool DualWriteComparisonLogging { get; set; }
+}

src/__Libraries/StellaOps.Infrastructure.Postgres/Options/PostgresOptions.cs

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+namespace StellaOps.Infrastructure.Postgres.Options;
+
+/// <summary>
+/// PostgreSQL connection and behavior options.
+/// </summary>
+public sealed class PostgresOptions
+{
+    /// <summary>
+    /// PostgreSQL connection string.
+    /// </summary>
+    public required string ConnectionString { get; set; }
+
+    /// <summary>
+    /// Command timeout in seconds. Default is 30 seconds.
+    /// </summary>
+    public int CommandTimeoutSeconds { get; set; } = 30;
+
+    /// <summary>
+    /// Maximum number of connections in the pool. Default is 100.
+    /// </summary>
+    public int MaxPoolSize { get; set; } = 100;
+
+    /// <summary>
+    /// Minimum number of connections in the pool. Default is 1.
+    /// </summary>
+    public int MinPoolSize { get; set; } = 1;
+
+    /// <summary>
+    /// Connection idle lifetime in seconds. Default is 300 seconds (5 minutes).
+    /// </summary>
+    public int ConnectionIdleLifetimeSeconds { get; set; } = 300;
+
+    /// <summary>
+    /// Enable connection pooling. Default is true.
+    /// </summary>
+    public bool Pooling { get; set; } = true;
+
+    /// <summary>
+    /// Schema name for module-specific tables. If null, uses public schema.
+    /// </summary>
+    public string? SchemaName { get; set; }
+
+    /// <summary>
+    /// Enable automatic migration on startup. Default is false for production safety.
+    /// </summary>
+    public bool AutoMigrate { get; set; }
+
+    /// <summary>
+    /// Path to SQL migration files. Required if AutoMigrate is true.
+    /// </summary>
+    public string? MigrationsPath { get; set; }
+}