add logging and use blocks behind

lib/api.d.ts

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+export {};

lib/database.d.ts

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+import { Model } from "sequelize";
+export interface DBTransaction {
+    symbol: string;
+    hash: string;
+    sender: string;
+    receiver: string;
+    amount: number;
+    block: number;
+    contract: string;
+}
+export declare const Transaction: import("sequelize/types").ModelCtor<Model<DBTransaction, DBTransaction>>;
+export declare function init(): Promise<void>;
+export declare function getLatestBlockNumberForSymbol(symbol: string): Promise<unknown>;
+export declare function getTransactionsToForSymbol(symbol: string, receiver: string): Promise<Model<DBTransaction, DBTransaction>[]>;
+export declare function getTransactionsFromForSymbol(symbol: string, sender: string): Promise<Model<DBTransaction, DBTransaction>[]>;
+export declare function getTransactionByHashForSymbol(symbol: string, hash: string): Promise<Model<DBTransaction, DBTransaction> | null>;

lib/eth.d.ts

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+import { TokenConfig } from "./index";
+export interface TokenApi {
+    symbol: string;
+    decimals: number;
+    address: string;
+    getTransactionsFromBlock: (from: number, to: number) => Promise<Erc20Transaction[]>;
+}
+export interface Erc20Transaction {
+    hash: string;
+    amount: number;
+    sender: string;
+    receiver: string;
+    block: number;
+}
+export declare function getCurrentBlockNumber(): Promise<number>;
+export declare function generateTokenApi(token: TokenConfig): Promise<TokenApi>;