Add data initi script

GEMINI.md

@@ -68,6 +68,17 @@
 
 ---
 
+## 📊 Data Management
+The project includes a compressed dataset of ~68,000 cities from Natural Earth.
+
+| Action | Command |
+| :--- | :--- |
+| **Import/Refresh Data** | `./import-cities.sh` |
+
+*Note: The script will truncate the `cities` table and perform a fresh import of the global dataset stored in `docker/data/cities.csv.gz`.*
+
+---
+
 ## 📝 Roadmap Highlights
 - [ ] Implement real ST_DWithin() PostGIS queries in the backend.
 - [ ] Import full Natural Earth/GeoNames datasets into the `cities` table.

import-cities.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# Configuration
+CONTAINER_NAME="line-of-sight-db"
+DB_USER="line_of_sight"
+DB_NAME="line_of_sight"
+DATA_FILE="./docker/data/cities.csv.gz"
+
+# Check if docker is available using the known path
+DOCKER_BIN="/usr/local/bin/docker"
+if [ ! -f "$DOCKER_BIN" ]; then
+    DOCKER_BIN=$(which docker)
+fi
+
+if [ -z "$DOCKER_BIN" ]; then
+    echo "Error: docker command not found."
+    exit 1
+fi
+
+# Check if data file exists
+if [ ! -f "$DATA_FILE" ]; then
+    echo "Error: Data file $DATA_FILE not found."
+    exit 1
+fi
+
+# Check if container is running
+if ! "$DOCKER_BIN" ps | grep -q "$CONTAINER_NAME"; then
+    echo "Error: Container $CONTAINER_NAME is not running."
+    echo "Please run 'docker-compose up -d' first."
+    exit 1
+fi
+
+echo "🚀 Starting database initialization..."
+
+# Use a HEREDOC to execute multi-line SQL
+# We load into a temp table first to handle the WKT -> Geography conversion
+IMPORT_SQL=$(cat <<EOF
+CREATE TEMP TABLE tmp_cities (
+    name VARCHAR(255),
+    population INTEGER,
+    country VARCHAR(100),
+    geom_wkt TEXT
+);
+
+COPY tmp_cities FROM STDIN WITH CSV HEADER;
+
+TRUNCATE cities;
+
+INSERT INTO cities (name, population, country, geom)
+SELECT 
+    name, 
+    population, 
+    country, 
+    ST_GeomFromText(geom_wkt, 4326)::geography
+FROM tmp_cities;
+
+DROP TABLE tmp_cities;
+
+SELECT count(*) || ' cities successfully imported.' as result FROM cities;
+EOF
+)
+
+# Stream the gzipped data into psql
+gunzip -c "$DATA_FILE" | "$DOCKER_BIN" exec -i -e PGPASSWORD=line_of_sight_pass "$CONTAINER_NAME" psql -U "$DB_USER" -d "$DB_NAME" -h 127.0.0.1 -c "$IMPORT_SQL"
+
+echo "✅ Initialization complete."