Adding python files

src/database/schema.sql

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+-- Microscopy Object Detection Application - Database Schema
+-- SQLite Database Schema for storing models, images, detections, and annotations
+
+-- Models table: stores trained model information
+CREATE TABLE IF NOT EXISTS models (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    model_name TEXT NOT NULL,
+    model_version TEXT NOT NULL,
+    model_path TEXT NOT NULL,
+    base_model TEXT NOT NULL DEFAULT 'yolov8s.pt',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    training_params TEXT,  -- JSON string of training parameters
+    metrics TEXT,          -- JSON string of validation metrics
+    UNIQUE(model_name, model_version)
+);
+
+-- Images table: stores image metadata
+CREATE TABLE IF NOT EXISTS images (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    relative_path TEXT NOT NULL UNIQUE,
+    filename TEXT NOT NULL,
+    width INTEGER,
+    height INTEGER,
+    captured_at TIMESTAMP,
+    added_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    checksum TEXT
+);
+
+-- Detections table: stores detection results
+CREATE TABLE IF NOT EXISTS detections (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    image_id INTEGER NOT NULL,
+    model_id INTEGER NOT NULL,
+    class_name TEXT NOT NULL,
+    x_min REAL NOT NULL CHECK(x_min >= 0 AND x_min <= 1),
+    y_min REAL NOT NULL CHECK(y_min >= 0 AND y_min <= 1),
+    x_max REAL NOT NULL CHECK(x_max >= 0 AND x_max <= 1),
+    y_max REAL NOT NULL CHECK(y_max >= 0 AND y_max <= 1),
+    confidence REAL NOT NULL CHECK(confidence >= 0 AND confidence <= 1),
+    detected_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    metadata TEXT,  -- JSON string for additional metadata
+    FOREIGN KEY (image_id) REFERENCES images (id) ON DELETE CASCADE,
+    FOREIGN KEY (model_id) REFERENCES models (id) ON DELETE CASCADE
+);
+
+-- Annotations table: stores manual annotations (future feature)
+CREATE TABLE IF NOT EXISTS annotations (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    image_id INTEGER NOT NULL,
+    class_name TEXT NOT NULL,
+    x_min REAL NOT NULL CHECK(x_min >= 0 AND x_min <= 1),
+    y_min REAL NOT NULL CHECK(y_min >= 0 AND y_min <= 1),
+    x_max REAL NOT NULL CHECK(x_max >= 0 AND x_max <= 1),
+    y_max REAL NOT NULL CHECK(y_max >= 0 AND y_max <= 1),
+    annotator TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    verified BOOLEAN DEFAULT 0,
+    FOREIGN KEY (image_id) REFERENCES images (id) ON DELETE CASCADE
+);
+
+-- Create indexes for performance optimization
+CREATE INDEX IF NOT EXISTS idx_detections_image_id ON detections(image_id);
+CREATE INDEX IF NOT EXISTS idx_detections_model_id ON detections(model_id);
+CREATE INDEX IF NOT EXISTS idx_detections_class_name ON detections(class_name);
+CREATE INDEX IF NOT EXISTS idx_detections_detected_at ON detections(detected_at);
+CREATE INDEX IF NOT EXISTS idx_detections_confidence ON detections(confidence);
+CREATE INDEX IF NOT EXISTS idx_images_relative_path ON images(relative_path);
+CREATE INDEX IF NOT EXISTS idx_images_added_at ON images(added_at);
+CREATE INDEX IF NOT EXISTS idx_annotations_image_id ON annotations(image_id);
+CREATE INDEX IF NOT EXISTS idx_models_created_at ON models(created_at);