Replace psycopg2-binary with pg8000

psycopg2 is licensed under LGPL that's not compatible with ASF -
https://www.apache.org/legal/resolved.html#category-x

Author: Gerrrr

hunter/postgres.py

@@ -2,7 +2,7 @@
 from datetime import datetime
 from typing import Dict
 
-import psycopg2
+import pg8000
 
 from hunter.analysis import ChangePoint
 from hunter.test_config import PostgresTestConfig
@@ -29,9 +29,9 @@ class Postgres:
     def __init__(self, config: PostgresConfig):
         self.__config = config
 
-    def __get_conn(self) -> psycopg2.extensions.connection:
+    def __get_conn(self) -> pg8000.dbapi.Connection:
         if self.__conn is None:
-            self.__conn = psycopg2.connect(
+            self.__conn = pg8000.dbapi.Connection(
                 host=self.__config.hostname,
                 port=self.__config.port,
                 user=self.__config.username,
@@ -43,7 +43,7 @@ def __get_conn(self) -> psycopg2.extensions.connection:
     def fetch_data(self, query: str):
         cursor = self.__get_conn().cursor()
         cursor.execute(query)
-        columns = [c.name for c in cursor.description]
+        columns = [c[0] for c in cursor.description]
         return (columns, cursor.fetchall())
 
     def insert_change_point(

poetry.lock

@@ -10,7 +10,6 @@ expandvars = "^0.6.5"
 numpy = "1.24"
 python = ">=3.8,<3.13"
 python-dateutil = "^2.8.1"
-psycopg2-binary = "^2.9.3"
 signal-processing-algorithms = "^1.3.2"
 "ruamel.yaml" = "=0.17.21"
 requests = "^2.25.1"
@@ -19,6 +18,7 @@ tabulate = "^0.8.7"
 validators = "^0.18.2"
 slack-sdk = "^3.4.2"
 google-cloud-bigquery = "^3.25.0"
+pg8000 = "^1.31.2"
 
 
 [tool.poetry.dev-dependencies]