first commit

migrations/V019__known_addresses.sql

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+-- Denormalized table of known email addresses extracted from message headers.
+-- Avoids expensive json_each() scanning of to_addresses/cc_addresses columns.
+CREATE TABLE IF NOT EXISTS known_addresses (
+    email      TEXT NOT NULL,
+    name       TEXT NOT NULL DEFAULT '',
+    PRIMARY KEY (email)
+);
+
+CREATE INDEX IF NOT EXISTS idx_known_addresses_name ON known_addresses(name);
+
+-- Backfill from existing messages: from_address
+INSERT INTO known_addresses (email, name)
+SELECT from_address, COALESCE(from_name, '')
+FROM messages
+WHERE from_address != ''
+ON CONFLICT(email) DO UPDATE SET name = excluded.name WHERE excluded.name != '';
+
+-- Backfill from existing messages: to_addresses (JSON array)
+INSERT INTO known_addresses (email, name)
+SELECT value->>'address', COALESCE(value->>'name', '')
+FROM messages, json_each(to_addresses)
+WHERE json_valid(to_addresses)
+  AND value->>'address' IS NOT NULL
+  AND value->>'address' != ''
+ON CONFLICT(email) DO UPDATE SET name = excluded.name WHERE excluded.name != '';
+
+-- Backfill from existing messages: cc_addresses (JSON array)
+INSERT INTO known_addresses (email, name)
+SELECT value->>'address', COALESCE(value->>'name', '')
+FROM messages, json_each(cc_addresses)
+WHERE json_valid(cc_addresses)
+  AND value->>'address' IS NOT NULL
+  AND value->>'address' != ''
+ON CONFLICT(email) DO UPDATE SET name = excluded.name WHERE excluded.name != '';