Fix import of old WhatsApp msgstore.db backups#272
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Old WhatsApp databases (pre-2022) lack `chat.group_type` and `message_media.media_caption` columns. Detect column presence via PRAGMA table_info and build queries adaptively, defaulting to 0/NULL when columns are absent. Fixes #271 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Key the schema column cache by (db pointer, table) instead of just table name, so inspecting multiple WhatsApp databases with different schemas in the same process produces correct results. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
chat.group_typeandmessage_media.media_captioncolumns in old WhatsApp schemas (pre-2022) viaPRAGMA table_info, defaulting to0/NULLwhen absent(db pointer, table)so multiple databases with different schemas in the same process get independent detectionFixes #271