feat: add source channel context history configuration and original sent timestamp

db/database.py

@@ -14,6 +14,7 @@ CREATE TABLE IF NOT EXISTS sources (
     channel_id BIGINT UNIQUE NOT NULL,
     username VARCHAR(255),
     title VARCHAR(255),
+    context_message_count INT DEFAULT 0,
     is_active BOOLEAN DEFAULT TRUE,
     created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
 );
@@ -59,6 +60,7 @@ CREATE TABLE IF NOT EXISTS posts (
     review_message_id BIGINT,
     scheduled_at TIMESTAMPTZ,
     published_at TIMESTAMPTZ,
+    source_created_at TIMESTAMPTZ,
     created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
     CONSTRAINT unique_source_message UNIQUE (source_channel_id, source_message_id)
 );
@@ -150,6 +152,9 @@ ALTER TABLE targets ADD COLUMN IF NOT EXISTS is_sleep_enabled BOOLEAN DEFAULT FA
 ALTER TABLE targets ADD COLUMN IF NOT EXISTS auto_source_ids BIGINT[] DEFAULT '{}';
 ALTER TABLE targets ADD COLUMN IF NOT EXISTS language VARCHAR(32) DEFAULT 'fa';
 ALTER TABLE targets ADD COLUMN IF NOT EXISTS custom_prompt TEXT DEFAULT '';
+ALTER TABLE sources ADD COLUMN IF NOT EXISTS context_message_count INT DEFAULT 0;
+ALTER TABLE posts ADD COLUMN IF NOT EXISTS source_created_at TIMESTAMPTZ;
+CREATE INDEX IF NOT EXISTS idx_posts_source_created ON posts(source_channel_id, source_created_at DESC);
 ALTER TABLE posts ADD COLUMN IF NOT EXISTS published_to JSONB DEFAULT '[]'::jsonb;
 ALTER TABLE posts ADD COLUMN IF NOT EXISTS is_deleted BOOLEAN DEFAULT FALSE;
 ALTER TABLE posts ADD COLUMN IF NOT EXISTS rejection_reason TEXT DEFAULT '';