multidb support

_tools/db/migrate.txt

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+python3 -m venv venv_migrate
+source venv_migrate/bin/activate  
+pip install sqlalchemy psycopg2-binary dotenv 
+docker compose --profile pgsql up -d --build
+PYTHONPATH=. python3 _tools/db/migrate_sqlite_to_pgsql.py 
+rm -rf venv_migrate
+
+# reset wszystkich sekwencji w pgsql
+docker exec -it pgsql-db psql -U zbiorki -d zbiorki
+
+
+DO $$
+DECLARE
+    r RECORD;
+BEGIN
+    FOR r IN
+        SELECT 
+            c.relname AS seq_name,
+            t.relname AS table_name,
+            a.attname AS column_name
+        FROM 
+            pg_class c
+        JOIN 
+            pg_depend d ON d.objid = c.oid
+        JOIN 
+            pg_class t ON d.refobjid = t.oid
+        JOIN 
+            pg_attribute a ON a.attrelid = t.oid AND a.attnum = d.refobjsubid
+        WHERE 
+            c.relkind = 'S'
+            AND d.deptype = 'a'
+    LOOP
+        EXECUTE format(
+            'SELECT setval(%L, COALESCE((SELECT MAX(%I) FROM %I), 1), true)',
+            r.seq_name, r.column_name, r.table_name
+        );
+    END LOOP;
+END$$;

_tools/db/migrate_sqlite_to_pgsql.py

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+import sys
+import os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../")))
+
+from sqlalchemy import create_engine, MetaData
+from sqlalchemy.orm import sessionmaker
+from config import Config
+from dotenv import load_dotenv
+load_dotenv()
+
+# Źródło: SQLite
+sqlite_engine = create_engine("sqlite:///instance/baza.db")
+sqlite_meta = MetaData()
+sqlite_meta.reflect(bind=sqlite_engine)
+
+# Cel: PostgreSQL
+pg_engine = create_engine(Config.SQLALCHEMY_DATABASE_URI)
+pg_meta = MetaData()
+pg_meta.reflect(bind=pg_engine)
+
+# Sesje
+SQLiteSession = sessionmaker(bind=sqlite_engine)
+PGSession = sessionmaker(bind=pg_engine)
+
+sqlite_session = SQLiteSession()
+pg_session = PGSession()
+
+def migrate_table(table_name):
+    print("➡️  Używana baza docelowa:", Config.SQLALCHEMY_DATABASE_URI)
+    print(f"\n➡️  Migruję tabelę: {table_name}")
+    source_table = sqlite_meta.tables.get(table_name)
+    target_table = pg_meta.tables.get(table_name)
+
+    if source_table is None or target_table is None:
+        print(f"⚠️  Pominięto: {table_name} (brak w jednej z baz)")
+        return
+
+    rows = sqlite_session.execute(source_table.select()).fetchall()
+    if not rows:
+        print("ℹ️  Brak danych do migracji.")
+        return
+
+    insert_data = [dict(row._mapping) for row in rows]
+
+    try:
+        with pg_engine.begin() as conn:
+            conn.execute(target_table.delete())
+            conn.execute(target_table.insert(), insert_data)
+        print(f"✅ Przeniesiono: {len(rows)} rekordów")
+    except Exception as e:
+        print(f"❌ Błąd przy migracji {table_name}: {e}")
+
+
+def main():
+    tables = ["user", "shopping_list", "item", "expense", "receipt", "suggested_product"]
+    for table in tables:
+        migrate_table(table)
+    print("\n🎉 Migracja zakończona pomyślnie.")
+
+if __name__ == "__main__":
+    main()