prepare initialisation of blockchain

pdm.lock

@@ -5,7 +5,7 @@
 groups = ["default", "data", "dev", "lint", "nb", "tests"]
 strategy = ["inherit_metadata"]
 lock_version = "4.5.0"
-content_hash = "sha256:a28bc9f6ac4aaed3d77e740ba7da7c420623e4edfba18854357238e4f95e759f"
+content_hash = "sha256:35fffc1c0ac0b0ad9c178fb759b2ea6f6db4c118739a667064025b9734c24eb0"
 
 [[metadata.targets]]
 requires_python = ">=3.11"
@@ -433,7 +433,7 @@ name = "colorama"
 version = "0.4.6"
 requires_python = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 summary = "Cross-platform colored terminal text."
-groups = ["dev", "nb", "tests"]
+groups = ["data", "dev", "nb", "tests"]
 marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
 files = [
     {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
@@ -2832,6 +2832,20 @@ files = [
     {file = "tornado-6.5.2.tar.gz", hash = "sha256:ab53c8f9a0fa351e2c0741284e06c7a45da86afb544133201c5cc8578eb076a0"},
 ]
 
+[[package]]
+name = "tqdm"
+version = "4.67.1"
+requires_python = ">=3.7"
+summary = "Fast, Extensible Progress Meter"
+groups = ["data"]
+dependencies = [
+    "colorama; platform_system == \"Windows\"",
+]
+files = [
+    {file = "tqdm-4.67.1-py3-none-any.whl", hash = "sha256:26445eca388f82e72884e0d580d5464cd801a3ea01e63e5601bdff9ba6a48de2"},
+    {file = "tqdm-4.67.1.tar.gz", hash = "sha256:f8aef9c52c08c13a65f30ea34f4e5aac3fd1a34959879d7e59e63027286627f2"},
+]
+
 [[package]]
 name = "traitlets"
 version = "5.14.3"

pyproject.toml

@@ -156,4 +156,5 @@ data = [
     "polars>=1.36.1",
     "pyarrow>=22.0.0",
     "pandas>=2.3.3",
+    "tqdm>=4.67.1",
 ]

src/dopt_pollublock_blockchain/blockchain.pyx

@@ -431,7 +431,10 @@ cdef class Blockchain:
 
     # // Python public API
     def __len__(self):
+        if self.genesis_done:
             return self._index + 1
+        else:
+            return 0
     
     @property
     def difficulty(self):

src/dopt_pollublock_blockchain/constants.py

@@ -0,0 +1,5 @@
+from __future__ import annotations
+
+from typing import Final
+
+BLOCKCHAIN_DIFFICULTY: Final[int] = 24

src/dopt_pollublock_blockchain/db.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
+import polars as pl
 import sqlalchemy as sql
 
 metadata_blockchain: sql.MetaData = sql.MetaData()
+metadata_sensor_data: sql.MetaData = sql.MetaData()
 
 blocks = sql.Table(
     "blocks",
@@ -14,3 +16,23 @@ blocks = sql.Table(
     sql.Column("hash", sql.String(64), nullable=False),
     sql.Column("data", sql.String(64), nullable=False),
 )
+
+sensor_data = sql.Table(
+    "sensor_data",
+    metadata_sensor_data,
+    sql.Column("Index", sql.Integer, primary_key=True, autoincrement=True),
+    sql.Column("Datetime", sql.DateTime, nullable=False),
+    sql.Column("Temperature_(Celsius)", sql.Float, nullable=False),
+    sql.Column("Pressure_(Pa)", sql.Integer, nullable=False),
+    sql.Column("Air_Quantity_(Percent)", sql.Float, nullable=False),
+    sql.Column("Blockchain_Block_Number", sql.BigInteger, nullable=True),
+)
+
+sensor_data_query_schema: dict[str, type[pl.DataType]] = {
+    "Index": pl.UInt64,
+    "Datetime": pl.Datetime,
+    "Temperature_(Celsius)": pl.Float32,
+    "Pressure_(Pa)": pl.Int32,
+    "Air_Quantity_(Percent)": pl.Float64,
+    "Blockchain_Block_Number": pl.UInt64,
+}