basic sql table structure for wallet

src/bin/wallet/wallet.sql

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+ATTACH DATABASE 'wallet.db' AS wallet KEY 'testkey';
+SELECT sqlcipher_export('wallet');
+CREATE TABLE IF NOT EXISTS keys(
+    key_id INT PRIMARY KEY NOT NULL,
+    key_public BLOB NOT NULL,
+    key_private BLOB NOT NULL
+);
+CREATE INDEX IF NOT EXISTS key_public on keys(key_public);
+