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migrations/V002__folders_and_messages.sql

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+-- Folder cache: stores the IMAP folder hierarchy
+CREATE TABLE IF NOT EXISTS folders (
+    name          TEXT PRIMARY KEY,
+    delimiter     TEXT,
+    parent        TEXT,
+    flags         TEXT NOT NULL DEFAULT '',
+    is_subscribed INTEGER NOT NULL DEFAULT 1,
+    total_count   INTEGER NOT NULL DEFAULT 0,
+    unread_count  INTEGER NOT NULL DEFAULT 0,
+    uid_validity  INTEGER NOT NULL DEFAULT 0,
+    highest_modseq INTEGER NOT NULL DEFAULT 0,
+    updated_at    TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+-- Message header cache: stores synced email headers per folder
+CREATE TABLE IF NOT EXISTS messages (
+    uid           INTEGER NOT NULL,
+    folder        TEXT NOT NULL,
+    message_id    TEXT,
+    in_reply_to   TEXT,
+    subject       TEXT NOT NULL DEFAULT '',
+    from_address  TEXT NOT NULL DEFAULT '',
+    from_name     TEXT NOT NULL DEFAULT '',
+    to_addresses  TEXT NOT NULL DEFAULT '',
+    cc_addresses  TEXT NOT NULL DEFAULT '',
+    date          TEXT NOT NULL,
+    flags         TEXT NOT NULL DEFAULT '',
+    size          INTEGER NOT NULL DEFAULT 0,
+    has_attachments INTEGER NOT NULL DEFAULT 0,
+    snippet       TEXT NOT NULL DEFAULT '',
+    body_cached   INTEGER NOT NULL DEFAULT 0,
+    body_html     TEXT,
+    body_text     TEXT,
+    references_header TEXT,
+    PRIMARY KEY (uid, folder),
+    FOREIGN KEY (folder) REFERENCES folders(name) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_messages_folder_date ON messages(folder, date DESC);
+CREATE INDEX IF NOT EXISTS idx_messages_message_id ON messages(message_id);
+CREATE INDEX IF NOT EXISTS idx_messages_in_reply_to ON messages(in_reply_to);