Add crud for blocks

mev_inspect/crud/blocks.py

@@ -0,0 +1,26 @@
+from mev_inspect.schemas.blocks import Block
+
+
+def delete_block(
+    db_session,
+    block_number: int,
+) -> None:
+    db_session.execute(
+        "DELETE FROM blocks WHERE block_number = :block_number",
+        params={"block_number": block_number},
+    )
+    db_session.commit()
+
+
+def write_block(
+    db_session,
+    block: Block,
+) -> None:
+    db_session.execute(
+        "INSERT INTO blocks (block_number, block_timestamp) VALUES (:block_number, :block_timestamp)",
+        params={
+            "block_number": block.block_number,
+            "block_timestamp": block.block_timestamp,
+        },
+    )
+    db_session.commit()