feat: read from db and plot difficulty factor vs time

plot.py

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+import psycopg2
+import matplotlib.pyplot as plt
+from mplcursors import cursor  # separate package must be installed
+
+# Connect to your postgres DB
+conn = psycopg2.connect("postgres://postgres:password@localhost:5420/postgres")
+
+# Open a cursor to perform database operations
+cur = conn.cursor()
+
+# Execute a query
+cur.execute("SELECT difficulty FROM logs ORDER BY difficulty")# LIMIT 100000")
+# Retrieve query results
+difficulty = cur.fetchall()
+
+cur.execute("SELECT time FROM logs ORDER BY difficulty")# LIMIT 100000")
+time = cur.fetchall()
+
+# reproducible sample data as a pandas dataframe
+#plt.figure(figsize=(4096, 4096))
+plt.scatter(difficulty, time)
+#cursor(hover=True)
+plt.show()

requirements.txt

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+contourpy==1.1.0
+cycler==0.11.0
+fonttools==4.42.0
+kiwisolver==1.4.4
+matplotlib==3.7.2
+mplcursors==0.5.2
+numpy==1.25.2
+packaging==23.1
+Pillow==10.0.0
+psycopg2==2.9.6
+pyparsing==3.0.9
+python-dateutil==2.8.2
+six==1.16.0