feat: Add MySQL to PostgreSQL migration tool with JSONB transformation

Implement comprehensive migration solution with:
- Full and incremental migration modes
- JSONB schema transformation for RAWDATACOR and ELABDATADISP tables
- Native PostgreSQL partitioning (2014-2031)
- Optimized GIN indexes for JSONB queries
- Rich logging with progress tracking
- Complete benchmark system for MySQL vs PostgreSQL comparison
- CLI interface with multiple commands (setup, migrate, benchmark)
- Configuration management via .env file
- Error handling and retry logic
- Batch processing for performance (configurable batch size)

Database transformations:
- RAWDATACOR: 16 Val columns + units → single JSONB measurements
- ELABDATADISP: 25+ measurement fields → structured JSONB with categories

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

config.py

@@ -0,0 +1,154 @@
+"""Configuration management using Pydantic settings."""
+from pydantic_settings import BaseSettings
+from typing import Optional
+import os
+
+
+class DatabaseConfig(BaseSettings):
+    """Database configuration."""
+
+    host: str
+    port: int
+    user: str
+    password: str
+    database: str
+
+    class Config:
+        env_prefix: str = ""
+
+
+class MySQLConfig(DatabaseConfig):
+    """MySQL source database configuration."""
+
+    class Config:
+        env_prefix: str = "MYSQL_"
+
+
+class PostgreSQLConfig(DatabaseConfig):
+    """PostgreSQL target database configuration."""
+
+    class Config:
+        env_prefix: str = "POSTGRES_"
+
+
+class MigrationSettings(BaseSettings):
+    """Migration settings."""
+
+    batch_size: int = 10000
+    log_level: str = "INFO"
+    dry_run: bool = False
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = False
+
+
+class BenchmarkSettings(BaseSettings):
+    """Benchmark settings."""
+
+    output_dir: str = "benchmark_results"
+    iterations: int = 5
+
+    class Config:
+        env_prefix: str = "BENCHMARK_"
+        env_file = ".env"
+        case_sensitive = False
+
+
+class Settings(BaseSettings):
+    """All application settings."""
+
+    mysql: MySQLConfig
+    postgres: PostgreSQLConfig
+    migration: MigrationSettings
+    benchmark: BenchmarkSettings
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = False
+
+    @classmethod
+    def from_env(cls):
+        """Load settings from environment variables."""
+        return cls(
+            mysql=MySQLConfig(),
+            postgres=PostgreSQLConfig(),
+            migration=MigrationSettings(),
+            benchmark=BenchmarkSettings(),
+        )
+
+
+# Lazy load settings
+_settings: Optional[Settings] = None
+
+
+def get_settings() -> Settings:
+    """Get application settings, loading from .env if necessary."""
+    global _settings
+    if _settings is None:
+        _settings = Settings.from_env()
+    return _settings
+
+
+# Schema transformation definitions
+RAWDATACOR_COLUMNS = {
+    "val_columns": ["Val0", "Val1", "Val2", "Val3", "Val4", "Val5", "Val6", "Val7", "Val8", "Val9", "ValA", "ValB", "ValC", "ValD", "ValE", "ValF"],
+    "unit_columns": ["Val0_unitmisure", "Val1_unitmisure", "Val2_unitmisure", "Val3_unitmisure", "Val4_unitmisure", "Val5_unitmisure", "Val6_unitmisure", "Val7_unitmisure", "Val8_unitmisure", "Val9_unitmisure", "ValA_unitmisure", "ValB_unitmisure", "ValC_unitmisure", "ValD_unitmisure", "ValE_unitmisure", "ValF_unitmisure"],
+}
+
+ELABDATADISP_MEASUREMENT_FIELDS = {
+    "shifts": ["XShift", "YShift", "ZShift", "HShift", "HShiftDir", "HShift_local"],
+    "coordinates": ["X", "Y", "Z", "Xstar", "Zstar"],
+    "kinematics": ["speed", "speed_local", "acceleration", "acceleration_local"],
+    "sensors": ["T_node", "load_value", "water_level", "pressure"],
+    "calculated": ["AlfaX", "AlfaY", "Area"],
+}
+
+ELABDATADISP_FIELD_MAPPING = {
+    # shifts mapping (source -> (category, key))
+    "XShift": ("shifts", "x"),
+    "YShift": ("shifts", "y"),
+    "ZShift": ("shifts", "z"),
+    "HShift": ("shifts", "h"),
+    "HShiftDir": ("shifts", "h_dir"),
+    "HShift_local": ("shifts", "h_local"),
+    # coordinates mapping
+    "X": ("coordinates", "x"),
+    "Y": ("coordinates", "y"),
+    "Z": ("coordinates", "z"),
+    "Xstar": ("coordinates", "x_star"),
+    "Zstar": ("coordinates", "z_star"),
+    # kinematics mapping
+    "speed": ("kinematics", "speed"),
+    "speed_local": ("kinematics", "speed_local"),
+    "acceleration": ("kinematics", "acceleration"),
+    "acceleration_local": ("kinematics", "acceleration_local"),
+    # sensors mapping
+    "T_node": ("sensors", "t_node"),
+    "load_value": ("sensors", "load_value"),
+    "water_level": ("sensors", "water_level"),
+    "pressure": ("sensors", "pressure"),
+    # calculated mapping
+    "AlfaX": ("calculated", "alfa_x"),
+    "AlfaY": ("calculated", "alfa_y"),
+    "Area": ("calculated", "area"),
+}
+
+# PostgreSQL Partition years (from both tables)
+PARTITION_YEARS = list(range(2014, 2032))  # 2014-2031
+
+# Table configurations
+TABLE_CONFIGS = {
+    "rawdatacor": {
+        "mysql_table": "RAWDATACOR",
+        "postgres_table": "rawdatacor",
+        "primary_key": "id",
+        "partition_key": "event_date",
+    },
+    "elabdatadisp": {
+        "mysql_table": "ELABDATADISP",
+        "postgres_table": "elabdatadisp",
+        "primary_key": "idElabData",
+        "partition_key": "event_date",
+    },
+}