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4gray
895a269200
Add tables, indexes, FTS5 virtual table, and triggers to support EPG (electronic program guide) data in the shared SQLite connection. The changes introduce epg_channels and epg_programs tables, multiple indexes for efficient lookups (by source, name, channel, start, and time range), and an epg_programs_fts virtual table with triggers to keep the full-text index synchronized with epg_programs. Register EPG database event handlers in the Electron backend and add an IPC handler for bulk-saving channels. The handler deletes existing channels for a source and inserts new channels in chunks to avoid large single inserts, returning the inserted count. These changes enable storing, querying, and full-text searching EPG data and prepare backend IPC endpoints for importing program guide data.